50 Gallon Hexagon Tank – The Ultimate Guide To Vertical Aquascaping

Have you ever looked at a corner in your home and thought it was the perfect spot for an aquarium, only to realize a standard rectangular tank just won’t fit? I’ve been there, and I know how frustrating it can be to balance your love for the hobby with the physical constraints of your living space.

The good news is that a 50 gallon hexagon tank offers a brilliant solution, providing a massive volume of water within a compact, vertical footprint. I promise that by the end of this guide, you will feel confident in your ability to master the unique challenges of a six-sided setup.

In the following sections, we will explore everything from specialized lighting for deep water to the specific fish species that thrive in tall environments. Whether you are a beginner or a seasoned pro, there is something incredibly elegant about a well-maintained hexagonal display that we are going to unlock together.

Understanding the Unique Dynamics of a 50 Gallon Hexagon Tank

Before we start pouring in the substrate, we need to talk about the “physics” of this specific shape. A 50 gallon hexagon tank is significantly taller than it is wide, which changes how oxygen moves through the water.

In a standard long tank, the surface area is vast, allowing for easy gas exchange. In a hexagon, that surface area is compressed. This means we have to be much more intentional about agitation and flow to keep our fish breathing easily.

Don’t let that intimidate you! It simply means we will prioritize a high-quality air stone or a filter with a strong return flow. Once you manage the gas exchange, the vertical height becomes a playground for creative design.

The Vertical Footprint Advantage

One of the biggest perks of this tank size is the 360-degree viewing potential. Because it is six-sided, you aren’t limited to a “front-facing” view. This makes it a perfect centerpiece for a room.

You can tuck it into a corner or place it between two seating areas. It allows you to observe your shrimp and fish from angles that a flat glass pane simply cannot provide. It’s like having a living piece of art that changes every time you walk around it.

Weight and Support Considerations

Remember, 50 gallons of water weighs roughly 415 pounds. When you add in the weight of the glass, the substrate, and the hardscape, you are looking at over 500 pounds of pressure on a small footprint.

Always ensure you are using a stand specifically rated for a hexagon shape. Never try to “overhang” a hex tank on a rectangular stand. The pressure needs to be distributed evenly across all six corners to prevent the seals from failing over time.

Essential Equipment for Depth and Clarity

When dealing with a deep aquarium, your standard “off-the-shelf” kits often fall short. To truly succeed with a 50 gallon hexagon tank, you need gear that can reach the bottom and penetrate the shadows.

The most common mistake I see hobbyists make is using a light that is too weak. If your tank is 24 to 30 inches deep, a basic LED strip won’t provide enough energy for plants at the substrate level.

Look for lights with high PAR (Photosynthetically Active Radiation) values. You want a light that “punches” through the water column. Pendal-style LEDs or high-output fixtures are your best friends here.

Filtration Strategies for Tall Tanks

In a tall tank, waste tends to settle in “dead spots” at the bottom where the filter intake might not reach effectively. I highly recommend using a canister filter for this setup.

Canister filters allow you to position the intake tube deep near the substrate and the output nozzle near the surface. This creates a vertical “loop” of water movement that prevents stagnant zones and keeps the temperature uniform from top to bottom.

If you prefer a Hang-On-Back (HOB) filter, make sure it has an adjustable intake extension. You want to pull water from the lower third of the tank to ensure all the water is being processed through your biological media.

Heating a Vertical Column

Heat rises, which can lead to a “thermocline” effect in tall tanks—where the top is warm and the bottom is chilly. To avoid this, place your heater near the filter’s output or use two smaller heaters placed at different heights.

I always suggest using an inkbird controller or a similar external thermostat. It provides an extra layer of safety, ensuring your heater doesn’t “stick” in the on position and cook your delicate inhabitants.

Creative Aquascaping: Building Up, Not Out

Aquascaping a hexagon tank is a total shift in mindset. Instead of thinking about “left to right” transitions, you have to think about layering and height. It’s about building a mountain rather than a meadow.

Start with a central focal point. A large piece of spider wood or a tall, craggy dragon stone stack works wonders. You want the hardscape to reach at least two-thirds of the way up the tank.

This provides “levels” for your fish to explore. Without tall hardscape, the top half of your tank will look empty and boring. Use aquarium-safe epoxy to secure rocks together so they don’t tumble against the glass.

Choosing the Right Substrate

Since cleaning the bottom of a deep tank can be a bit of a reach, I recommend a substrate that is easy to vacuum. A medium-grade sand or a heavy specialized plant soil like ADA Amazonia or Fluval Stratum is ideal.

Avoid extremely fine sands that can easily be sucked up into your siphon. You want something with enough weight to stay put while you’re waving a gravel vac around 24 inches below the surface.

The “Island” Layout Technique

The most successful hex tanks usually follow an “island” layout. This means the tallest elements are in the center, and the scape tapers down toward the glass on all sides.

This keeps the glass clear for cleaning and gives the fish a 360-degree swimming path around the decor. It also makes the tank feel much larger than it actually is by creating a sense of depth and mystery in the “back” of the island.

Stocking Strategies: The Best Fish for Tall Environments

Not all fish are suited for a 50 gallon hexagon tank. For example, active horizontal swimmers like Giant Danios or Rainbowfish will feel cramped because they lack a long “runway” to build up speed.

Instead, we want to look for fish that appreciate vertical space or those that are “stationary” swimmers. This is where the magic of the hexagon really shines!

The primary goal is to fill the “zones” of the tank: the bottom, the middle, and the top. This ensures that every inch of your 50-gallon volume is put to good use.

The Perfect Centerpiece: Angelfish

If there was ever a fish designed for a hexagon tank, it’s the Angelfish (Pterophyllum scalare). Their tall, thin bodies are perfectly adapted for navigating vertical structures and plants.

In a 50-gallon hex, you could comfortably keep a mated pair or a small group of juveniles. Watching them glide up and down the water column is hypnotic. They fill the mid-to-upper levels beautifully.

Filling the Mid-Water with Schooling Fish

To complement your centerpiece, look for deep-bodied tetras. Bleeding Heart Tetras, Rosy Tetras, or Diamond Tetras are excellent choices. They don’t need a 4-foot long tank to feel secure.

A school of 10-12 of these tetras will stay tightly knit in the center of the tank. Their shimmering scales will catch the light from all six sides, creating a stunning visual effect as they pivot through the water.

The Cleanup Crew: Bottom Dwellers

For the bottom, you can’t go wrong with Corydoras Catfish or Kuhli Loaches. Even though the floor space is smaller than a standard tank, 50 gallons still provides enough “real estate” for a group of 6-8 Corys.

If you are a fan of shrimp, a colony of Amano Shrimp or Cherry Shrimp will love climbing your tall hardscape. They will treat your driftwood like a multi-story apartment complex, cleaning every level as they go.

Planting Success in Deep Waters

Plants are the secret to a healthy 50 gallon hexagon tank, but they come with a “depth tax.” Light loses intensity quickly as it travels through water. This means we have to be strategic about what we plant where.

I always tell people to think of their tank in “light zones.” The top 10 inches is “High Light,” the middle is “Medium Light,” and the bottom is “Low Light” (unless you have a very powerful professional fixture).

Don’t worry—this setup is perfect for beginners if you choose the right species! You just need to match the plant’s needs to the depth of the tank.

Low-Light Kings for the Substrate

Since the bottom of a 50-gallon hex is quite far from the light source, stick with “bulletproof” plants. Anubias and Java Fern are perfect because they don’t even need to be buried in the substrate.

You can superglue (using cyanoacrylate gel) these plants directly onto your driftwood or rocks at various heights. Cryptocoryne species also do very well in the lower-light conditions of a deep tank’s floor.

Reaching for the Surface

For the background (or the center of your island), use “tall” plants that will grow toward the light. Vallisneria is a classic choice. It produces long, grass-like blades that will eventually reach the surface and “carpet” the top of the water.

Another great option is Amazon Swords. These are heavy root feeders, so make sure to tuck a few root tabs into the substrate around them every few months. They will grow massive and provide great hiding spots for your Angelfish.

Floating Plants for Nutrients

If you find that your nitrates are creeping up, consider some floating plants like Frogbit or Salvinia. However, be careful! If they cover the entire surface, they will block the light from reaching the plants at the bottom.

I like to use a “floating ring” (a simple piece of airline tubing) to keep the floaters in one corner. This allows light to pass through the rest of the surface while still giving you the nitrate-scrubbing benefits of floating flora.

Common Challenges and Pro Maintenance Tips

Let’s be honest: maintaining a 50 gallon hexagon tank requires a bit more physical effort than a shallow tank. If you have short arms, reaching the back-bottom corner can feel like a workout!

The first tool you should buy is a pair of extra-long aquascaping tweezers and scissors (at least 15-18 inches). These allow you to plant and prune without getting your entire arm wet.

I also recommend a magnetic glass cleaner. Since you have six panes of glass to clean, a magnet makes the job much faster. Just be careful not to trap sand under the magnet, or you’ll scratch your beautiful display.

Mastering the Water Change

When siphoning a tall tank, gravity is your friend. Ensure your bucket or drain point is significantly lower than the bottom of the tank to maintain a strong suction.

Because the surface area is small, you might notice a “protein film” or oily slick forming on the top of the water. This is common in hex tanks. To fix this, adjust your filter output to break the surface tension, or use a surface skimmer.

Algae Management in Deep Tanks

Algae loves the “dead zones” where water flow is weak. If you notice tufts of hair algae on your plants, it’s a sign you need more circulation. Adding a tiny nano-powerhead hidden behind your driftwood can solve this instantly.

Also, watch your light duration. Because you need strong lights to reach the bottom, it’s easy to over-illuminate the top. If the top of your driftwood is getting covered in green spot algae, try reducing your “lights-on” time to 6 or 7 hours a day.

Frequently Asked Questions (FAQ)

Is a 50 gallon hexagon tank good for beginners?

Yes, absolutely! While the shape requires some specific equipment choices, the 50-gallon volume is very stable. Larger volumes of water are more forgiving of beginner mistakes than small 10-gallon tanks.

Can I keep Goldfish in a hexagon tank?

I generally advise against it. Goldfish are high-waste producers and need a lot of surface area for oxygen exchange. They also prefer swimming horizontally. A 50-gallon hex is much better suited for tropical community fish like Angelfish or Gouramis.

How do I clean the very bottom of the tank?

Invest in a gravel vacuum with a long rigid tube (24 inches or more). If you can’t reach, you can even extend the tubing with a piece of PVC pipe. It makes reaching those deep corners much easier on your back!

What is the best lighting for a 50 gallon hexagon tank?

Look for high-intensity LED pendants or fixtures specifically labeled for “deep” or “planted” aquariums. Avoid the cheap “starter kit” lights, as they won’t have the power to grow plants at a 24-inch depth.

How many fish can I put in a 50-gallon hex?

Because the surface area is lower than a 50-gallon “long” tank, you should stock slightly more lightly. Aim for about 75-80% of what you would put in a standard 50-gallon tank to ensure everyone has enough oxygen.

Conclusion

Setting up a 50 gallon hexagon tank is a journey into the world of vertical design. It challenges you to think differently about space, light, and flow, but the reward is a breathtaking, 360-degree view of a thriving underwater world.

By focusing on “punchy” lighting, vertical-friendly fish like Angelfish, and a central island aquascape, you can create a masterpiece that fits into any corner of your home. Remember to prioritize gas exchange and use the right tools to make maintenance a breeze.

You’ve got this! The hexagonal aquarium is a classic for a reason—it’s bold, it’s beautiful, and it brings a unique architectural element to the fish-keeping hobby. Happy reefing (or planting)!