90 Gallon Hexagon Fish Tank – A Masterclass In Aquascaping And Vertica
If you’ve ever stood in an aquarium shop and felt drawn to a tank that breaks the mold of the traditional rectangular box, you’ve likely locked eyes with a 90 gallon hexagon fish tank. These stunning, multi-faceted centerpieces offer a unique vertical perspective that transforms a room into a living piece of art.
We know that choosing an unconventional shape can feel intimidating. You might worry about maintenance access, water flow, or light penetration. But don’t worry—this setup is perfect for those who want to push their creative boundaries. By the end of this guide, you’ll have the confidence to master the vertical aquatic landscape.
Understanding the Unique Geometry of Your Setup
The 90 gallon hexagon fish tank is a departure from standard horizontal tanks. While a rectangular tank prioritizes surface area for gas exchange, a hexagonal tank prioritizes vertical height. This offers a breathtaking view from multiple angles.
Because of the depth, you aren’t just decorating a foreground and background; you are working with layers. Think of it like building a skyscraper rather than a ranch house. Your aquascaping strategy needs to account for this extra column of water.
The Challenge of Light Penetration
Light intensity drops off significantly as it travels deeper into the water column. In a deep hexagon, the substrate might be 24 to 30 inches away from your light source.
If you plan on keeping high-light aquatic plants like Ludwigia or Alternanthera reineckii, you will need a high-lumen, high-PAR LED fixture. For beginners, stick to low-light species like Anubias and Java Fern, which can be easily attached to taller pieces of driftwood to bring them closer to the light.
Mastering Filtration and Water Flow
One of the most common pitfalls with a 90 gallon hexagon fish tank is creating “dead zones.” Because of the six corners, water can stagnate behind dense rock work or tall plants if your filter output isn’t positioned correctly.
Your goal is to create a circular flow pattern that moves water from the bottom corners up toward the surface. This ensures that oxygen-rich water reaches the substrate and keeps debris suspended so your filter can catch it.
Choosing the Right Hardware
- Canister Filters: These are the gold standard for this tank shape. They offer superior mechanical and biological filtration without cluttering the display.
- Powerheads: You might need a small circulation pump or powerhead tucked behind a rock formation to prevent detritus buildup in the lower corners.
- Heater Placement: Always place your heater near the intake of your filter. This ensures that the warm water is immediately circulated throughout the entire column, preventing hot or cold pockets.
Stocking Strategies for Vertical Space
When stocking a 90 gallon hexagon fish tank, you must consider the fish’s natural swimming habits. Because the footprint is more compact than a 90-gallon long, you should avoid high-energy, fast-swimming species that require long horizontal runs.
Instead, look for fish that thrive in “mid-water” environments or species that appreciate vertical structure. Think of schools that move in tight formations or fish that occupy different levels of the tank.
Suggested Stocking Profiles
- The Mid-Level Dwellers: A large school of 15–20 Neon Tetras or Rummy Nose Tetras will look spectacular as they spiral through the tank.
- The Centerpiece: An Angelfish or a pair of Discus (if you are an advanced keeper) makes excellent use of the vertical height. Their tall, graceful fins are highlighted perfectly in this tank shape.
- The Bottom Crew: Corydoras catfish are still a great choice, but ensure you have a “sandy beach” area at the base. Cherry shrimp also love to scavenge the nooks and crannies of hardscape in the lower sections.
Hardscaping for a 90 Gallon Hexagon Fish Tank
The secret to a beautiful hexagonal aquarium is the “pillar” or “island” aquascape. Avoid stacking rocks against the back glass, as you will lose the ability to view the tank from multiple sides.
Instead, build a central pillar using sturdy spider wood or dragon stone. This creates a vertical focal point that draws the eye upward. As your plants grow, this structure will become a lush, green tower that hides equipment and provides shelter for your inhabitants.
Tips for Structural Integrity
- Use Aquarium-Safe Epoxy: When building a tall structure, never rely on gravity alone. Glue your rocks or wood pieces together to prevent a collapse during maintenance.
- Layered Substrate: Use a high-quality nutrient-rich substrate at the base for your plants, topped with a cap of fine gravel or sand to keep the water clean and provide a surface for your bottom dwellers.
Maintenance Tips for Deep Aquariums
Maintenance on a 90 gallon hexagon fish tank is slightly different due to the depth. You will likely need a pair of long-reach aquarium tongs and an extra-long gravel siphon.
Don’t let the height intimidate you. If you have the right tools, reaching the bottom is simple. Keep a dedicated step stool nearby so you can get a clear view of the substrate when performing water changes.
Essential Tool Kit
- Extra-long tweezers (15+ inches): For planting and trimming.
- A heavy-duty scraper: Since you have more surface area on the glass, a long-handled algae scraper is essential.
- A deep-reach siphon: Essential for removing waste from the bottom corners without disturbing your delicate aquascape.
Frequently Asked Questions
Is a 90 gallon hexagon fish tank harder to clean than a rectangular one?
It is not necessarily harder, but it requires different tools. Because you have more depth, you’ll need long-handled tools to reach the bottom. However, the footprint is smaller, meaning you may have less surface area to scrub!
Can I keep live plants in a tall hexagon tank?
Absolutely! The key is lighting. You need an LED light with high intensity to ensure the light reaches the bottom. Focus on slow-growing, low-to-medium light plants if you are a beginner, as they are more forgiving of lower light levels at the substrate level.
Will my fish feel cramped in a hexagon shape?
Not if you stock appropriately. By avoiding overly active schooling fish that need long straightaways, and instead choosing species that enjoy vertical movement, your fish will thrive in this environment.
How do I prevent water stagnation in the corners?
The best way to prevent dead zones is to ensure your filter output is angled to create a circular flow. If you notice debris settling in a specific corner, a small, adjustable powerhead can be aimed to keep the water moving in that area.
Conclusion
The 90 gallon hexagon fish tank is a unique, rewarding challenge that offers a viewing experience few other tanks can match. It demands a bit more planning regarding light and flow, but the payoff is a vertical aquatic display that captures the imagination of everyone who enters the room.
Take your time with the hardscape, choose your fish with the vertical space in mind, and don’t be afraid to experiment with different plant heights. With these tips, you’re well on your way to creating a stunning underwater tower. Happy fish keeping!
