45 Gallon Hexagon Fish Tank – A Masterclass In Vertical Aquascaping
Many hobbyists fall in love with the unique silhouette of a 45 gallon hexagon fish tank the moment they see one in a showroom. It is a stunning piece of living furniture that draws the eye upward, acting as a centerpiece in any room.
However, as an experienced aquarist, I know that vertical tanks come with their own set of unique challenges. While a standard rectangular tank offers a large surface area for oxygen exchange, a hexagon tank demands a more thoughtful approach to water flow, filtration, and species selection.
Don’t worry—this setup is perfect for both beginners and intermediate keepers if you know the right tricks. Whether you are looking to build a lush planted environment or a vibrant community of schooling fish, this guide will help you turn your tank into a thriving aquatic ecosystem.
Understanding the Dynamics of a 45 Gallon Hexagon Fish Tank
The most significant difference between a standard aquarium and a 45 gallon hexagon fish tank is the depth. Because these tanks are tall, water circulation behaves differently than it does in a shallow, long aquarium.
You have to account for oxygenation at the bottom of the water column. In a deep tank, the water near the substrate can become stagnant if your filter isn’t positioned correctly.
Why Vertical Space Matters
Most fish don’t just swim left to right; they inhabit specific layers. A hexagon shape allows you to create distinct “zones” within the tank. You can have a heavily planted bottom layer for bottom-dwellers, a mid-section for schooling fish, and an open top area for surface-feeders.
The Challenge of Maintenance
Because the tank is deep, reaching the gravel at the bottom can be a challenge. I always recommend getting long-handled aquarium tweezers and a specialized gravel vacuum. This makes routine maintenance much less of a chore and keeps your hands out of the water.
Selecting the Right Filtration and Lighting
In a 45 gallon hexagon fish tank, your equipment needs to be as unique as the shape of the glass. Standard hang-on-back (HOB) filters can sometimes struggle to push water down to the very bottom corners.
Choosing Your Filter
I highly recommend an external canister filter for this setup. Canister filters provide excellent biological filtration and allow you to place the intake tube near the bottom and the spray bar near the top. This ensures a circular flow of water that reaches every corner of the hexagon, preventing “dead zones” where waste accumulates.
Lighting for Deep Tanks
Light intensity drops off significantly as it travels through water. If you plan on keeping aquatic plants, you need a high-quality LED light with strong penetration power. Look for lights specifically rated for “deep” aquariums so that your carpeting plants at the bottom receive enough PAR (Photosynthetically Active Radiation) to thrive.
Designing Your Layout: The Art of Vertical Aquascaping
When you have a 45 gallon hexagon fish tank, the “rule of thirds” shifts from horizontal to vertical. You want to build up rather than out.
Using Hardscape to Create Height
Use tall pieces of driftwood or large, stackable rocks like Seiryu stone to create a mountain-like effect. This draws the viewer’s eye upward and makes the tank feel much larger than it actually is.
The Planting Strategy
Place taller, stem-heavy plants like Vallisneria or Ludwigia in the back and sides to create a lush, jungle-like backdrop. Use shorter foreground plants like Cryptocoryne parva or Anubias nana on driftwood near the middle. This creates depth and gives your fish plenty of places to hide, which reduces stress and brings out their best colors.
Choosing the Best Inhabitants for Your Setup
Stocking a hexagon tank is different from stocking a long tank because you have less horizontal swimming room. You want to avoid high-energy fish that need long stretches to dart back and forth.
Top-Tier Stocking Suggestions
- Schooling Fish: Smaller tetras, like Neon Tetras or Rummy Nose Tetras, look spectacular in a vertical column as they move in unison.
- Mid-Level Dwellers: A school of Rasboras or a small group of Gouramis provides personality and constant movement.
- Bottom Dwellers: Avoid large groups of Corydoras, as they prefer floor space. Instead, consider a few Nerite snails or a colony of Cherry shrimp to manage algae and provide a dynamic bottom-layer presence.
Always remember to research the adult size of your fish. Even in a 45-gallon tank, the footprint (the glass bottom) is smaller than a 45-gallon rectangular tank. Don’t overstock the bottom section, or you will quickly deal with water quality issues.
Common Problems and How to Solve Them
Every experienced aquarist has faced a few hurdles, and the 45 gallon hexagon fish tank is no exception. Here are the most common issues I see and how to fix them quickly.
Poor Water Flow
If you notice debris building up on the substrate, your filter output isn’t strong enough. Try adjusting the angle of your spray bar to create a gentle vortex current. This keeps waste suspended long enough for the filter intake to pull it out of the water column.
Algae Blooms
Because these tanks are often placed in corners or near windows, they can be prone to algae due to uneven lighting. If you see algae growing on the glass, reduce your photoperiod (the amount of time the lights are on) to 6–8 hours and consider adding a small cleanup crew like Amano shrimp.
Frequently Asked Questions (FAQ)
Is a 45 gallon hexagon fish tank good for beginners?
Yes, it is! While the shape is unique, 45 gallons is a generous volume of water. This large water volume makes the ecosystem stable and forgiving of minor mistakes, which is exactly what a beginner needs.
How often should I change the water?
In a moderately stocked tank, a 20–25% water change every week is perfect. Because of the depth, make sure you use a long-neck siphon to reach the bottom where fish waste tends to settle.
Can I keep Goldfish in this tank?
I generally advise against it. Goldfish produce a massive amount of waste and prefer horizontal swimming space. A 45-gallon hexagon is better suited for tropical community fish.
How do I clean the bottom corners of a hexagon tank?
Use a magnetic glass cleaner for the sides and a flexible-tube gravel vacuum for the bottom. If the corners are tight, a simple clean toothbrush on a long rod works wonders for scrubbing hard-to-reach spots.
Conclusion
Keeping a 45 gallon hexagon fish tank is a rewarding experience that combines the beauty of interior design with the science of fish keeping. By focusing on vertical water flow, choosing the right lighting for depth, and carefully selecting fish that thrive in vertical spaces, you can create a stunning piece of art.
Don’t be intimidated by the unique shape. Once you get your filtration and circulation balanced, you will find that these tanks are just as easy to maintain as any standard setup.
Take your time with the hardscape, cycle your tank properly, and enjoy the process of watching your underwater world grow. If you have any questions along the way, remember that the best aquarists are those who are always learning. Happy fish keeping!
