35 Gallon Hexagon Fish Tank Setup – The Ultimate Guide To A Stunning V
Have you ever walked into a room and been immediately drawn to a towering, crystal-clear aquatic display? There is something magical about a vertical aquarium that traditional rectangular tanks just can’t match.
If you have recently acquired one, you probably agree that their unique shape offers a striking aesthetic that fits perfectly into corners or tight spaces. However, a 35 gallon hexagon fish tank setup comes with its own set of challenges that can stump even experienced hobbyists.
In this guide, I promise to walk you through every single step of the process, from selecting the right gear to choosing the perfect inhabitants. We will explore how to maximize vertical space, ensure proper oxygenation, and create a thriving ecosystem that looks like a slice of the Amazon right in your living room.
Understanding the Unique Dynamics of a Hexagon Tank
Before we dive into the hardware, we need to talk about the “physics” of your new tank. A 35-gallon hexagon is much taller than it is wide, which means the surface area is significantly smaller than a standard 29 or 40-gallon breeder.
This matters because gas exchange—the process where oxygen enters the water and carbon dioxide leaves—happens at the surface. In a deep tank, getting oxygen down to the bottom layers requires a bit more intentionality in your design.
Additionally, the height of the tank affects how light reaches your plants. Standard LED strips might not have the “punch” to reach the substrate 24 inches down. Don’t worry, though; we have specific workarounds for these vertical hurdles.
Essential Equipment for Your 35 Gallon Hexagon Fish Tank Setup
Choosing the right equipment is the foundation of a successful aquarium. Because of the unique dimensions, you cannot simply grab the first “30-40 gallon” filter you see on the shelf.
Selecting the Right Filtration
For a 35 gallon hexagon fish tank setup, I highly recommend a canister filter or a high-quality Hang-On-Back (HOB) filter with an adjustable intake.
Since the tank is deep, you need a filter that can pull water from the very bottom to ensure there are no “dead zones” where waste accumulates. A canister filter like the Fluval 207 is excellent because you can position the intake and output to create a circular flow that reaches every pane of glass.
Lighting for Deep Water
Lighting a tall tank is tricky. Most “kit” lights are only designed for tanks 12-18 inches deep. For a 35-gallon hex, look for high-output LED fixtures or “pendant” style lights.
You want a light with a narrow beam angle that can penetrate through 20+ inches of water. This ensures your foreground plants don’t “stretch” or turn yellow at the base due to lack of photosynthetic energy.
Heating and Circulation
Heat rises, so in a tall tank, the top can be significantly warmer than the bottom. To prevent this, place your heater near the filter intake or use an airstone at the bottom.
The bubbles from an airstone do more than just look pretty; they create a vertical current that pulls cold water up and pushes oxygenated water down. This is a non-negotiable for a healthy hexagon setup.
Designing a Vertical Masterpiece: Aquascaping Tips
The biggest mistake people make with a 35 gallon hexagon fish tank setup is treating the floor like a standard rectangular tank. You have a massive vertical canvas—use it!
Choosing the Right Substrate
Start with a high-quality aquarium soil if you plan on keeping live plants. Since you won’t have a lot of horizontal “floor” space, every inch of substrate counts.
I recommend “sloping” the substrate. Make it deeper in the back and shallower in the front. This creates an illusion of depth and gives you more room to anchor large, tall pieces of hardscape.
Hardscaping with Height
Forget small rocks; you need Manzanita wood or Spider wood. These types of driftwood have long, reaching “fingers” that can extend from the bottom of the tank all the way to the surface.
Positioning a large, vertical piece of wood as a central focal point draws the eye upward and provides hiding spots for your fish at multiple levels of the water column. You can also stack Dragon Stone to create “cliffs” that mimic a mountain stream.
Plant Selection for Tall Tanks
When choosing plants, think about their final height. You want a mix of “background” plants that will fill the vertical space and “low-light” plants for the bottom.
- Vallisneria: This grass-like plant can grow up to 3 feet long, making it perfect for spiraling up the corners of a hex tank.
- Amazon Swords: These have broad, tall leaves that provide great cover for larger fish.
- Anubias and Java Fern: These are epiphytes, meaning you can glue or tie them to your tall driftwood. This adds greenery to the middle and upper sections of the tank where light is strongest.
Best Fish and Invertebrates for a Hexagon Tank
Stocking a hexagon tank is different than stocking a long tank. Active, fast-swimming fish like Giant Danios or certain Barbs might feel cramped because they lack horizontal swimming room. Instead, look for fish that appreciate “height” or are relatively sedentary.
The Centerpiece Fish
A 35-gallon tank is a perfect home for a single Angelfish or a pair of Pearl Gouramis. These fish have tall, compressed bodies that look stunning as they glide through vertical driftwood.
Pro Tip: Avoid keeping multiple male Gouramis, as the limited surface area can lead to territorial disputes during bubble-nest building.
Schooling Fish
For your middle layer, consider a school of 10-12 Rummy Nose Tetras or Cardinal Tetras. These fish tend to stay in a tight group and will move up and down the water column, adding vibrant color to the “void” in the middle of the tank.
Bottom Dwellers and Cleaners
Since the “floor” of a 35-gallon hex is small, don’t overdo the bottom dwellers. A small group of 6 Panda Corydoras or a few Otocinclus Catfish are perfect for keeping the substrate and glass clean without feeling crowded.
If you love invertebrates, a colony of Cherry Shrimp or a couple of Nerite Snails will thrive in the nooks and crannies of your vertical hardscape.
Step-by-Step Installation Guide
Now that you have your plan, it is time to put your 35 gallon hexagon fish tank setup together. Follow these steps to ensure a smooth launch.
Step 1: Placement and Leveling
Hexagon tanks exert a lot of pressure on their seams because of the height of the water column. It is absolutely vital that your tank sits on a level, sturdy surface.
Use a carpenter’s level to check the stand. If it’s even slightly tilted, the pressure could cause a leak over time. I always recommend using a dedicated aquarium stand designed for hexagon footprints.
Step 2: Hardscape and Substrate
Add your substrate first, then carefully position your tall driftwood or stones. Double-check that your tall pieces are stable. You don’t want a heavy piece of wood tipping over and hitting the glass!
Step 3: Planting and Filling
Fill the tank about 1/3 of the way with de-chlorinated water. This makes it much easier to plant your Vallisneria or Swords into the substrate without them floating away.
Once planted, place a small plate over the substrate and pour the rest of the water onto the plate. This prevents the water flow from uprooting your hard work and clouding the tank.
Step 4: The Nitrogen Cycle
This is the most important step! Do not add fish immediately. You must “cycle” the tank to build up beneficial bacteria that process toxic ammonia into safe nitrates.
Use a liquid testing kit to monitor your levels. This process usually takes 2-4 weeks. Adding a bottled bacteria starter can help speed this up, but patience is your best friend here.
Maintenance Tips for a Tall Tank
Maintaining a 35 gallon hexagon fish tank setup requires a few specialized tools. Because the tank is deep, reaching the bottom with your bare hands can be a challenge (and a mess).
- Extra-Long Algae Scrapers: Invest in a scraper with a 24-inch handle so you can clean the bottom corners without getting your shoulders wet.
- Long Aquascaping Tweezers: These are essential for pruning dead leaves or replanting “floaters” at the bottom of the tank.
- The “Chimney Effect”: During water changes, use your siphon to “vacuum” the substrate thoroughly. Because the footprint is small, waste can build up quickly in the gravel.
FAQ Section
Q: Can I keep Goldfish in a 35 gallon hexagon tank?
A: I wouldn’t recommend it. Goldfish produce a lot of waste and need high oxygen levels. The limited surface area of a hexagon tank makes it difficult to keep the water quality high enough for them. Stick to tropical fish!
Q: How many fish can I put in a 35 gallon hex?
A: Rather than the “inch per gallon” rule, think about “zones.” Aim for 1 centerpiece fish, 10-12 mid-water schoolers, and 5-6 bottom dwellers. Overstocking a hex tank is dangerous due to the lower oxygen exchange.
Q: Why are my plants dying at the bottom of the tank?
A: This is likely a lighting issue. Most standard lights can’t reach the bottom of a 24-inch tall tank. Consider upgrading to a full-spectrum LED with better penetration or stick to low-light plants like Java Moss or Anubias.
Q: Is a 35 gallon hexagon tank good for beginners?
A: Yes, as long as you understand the limitations of the shape! It requires a bit more thought regarding equipment and stocking, but the visual reward is well worth the extra planning.
Final Thoughts on Your New Setup
Setting up a 35 gallon hexagon fish tank setup is a rewarding project that results in a stunning, space-saving display. By focusing on vertical hardscaping, choosing the right “tall” inhabitants, and ensuring your filtration can handle the depth, you are setting yourself up for long-term success.
Remember, the key to a beautiful aquarium isn’t just how it looks on day one, but how it grows over time. Be patient with the nitrogen cycle, keep up with your weekly water changes, and don’t be afraid to prune those tall plants to keep the “vibe” exactly how you want it.
Happy fish keeping, and enjoy the view from your new vertical oasis!
