I Built a Mega Fish Tank (for the coolest fish)

TerraGreen

This video has been trending in Papua New Guinea, United States, Canada, and United Kingdom

The video opens with the creator explaining that years of keeping small and medium-sized aquariums have inspired him to attempt something far more ambitious: a custom “mega” fish tank that will become the focal point of his fish room. He walks viewers through the vision—an expansive, low-iron glass aquarium large enough to let “monster” fish exhibit natural behavior, complete with a bespoke stand, oversized filtration, and a dramatic aquascape that can be appreciated from multiple viewing angles. Early scenes cover planning, precise measurements, and the choice of materials, emphasizing why thicker glass, beefy bracing, and industrial-strength silicone are non-negotiable when you’re holding hundreds of gallons of water in a residential space.

Construction quickly shifts into a fast-paced time-lapse. The creator fabricates a welded steel frame, adds leveling feet, and tops it with marine-grade plywood before lowering the giant glass panels into place with suction cups and a small crew. Step by step, he demonstrates sealing the seams, letting the silicone cure, and performing a 24-hour leak test that involves filling the tank in stages to monitor bowing and stress points. While the water level rises, he shows off the filtration hardware: oversized canister filters paired with a sump system, redundant heaters controlled by external thermostats, and a battery-backed air pump for power outages. Attention to detail—like insulating plumbing to reduce vibration and adding union fittings for easy maintenance—shows the creator’s experience and underscores the importance of reliability in large aquariums.

Once the tank passes its structural tests, the focus turns to aquascaping. Bags of specialized substrate are rinsed and layered to encourage beneficial bacteria, followed by large pieces of spider wood, hand-selected slate, and artificially anchored plants that can withstand boisterous fish. LED light bars are suspended on adjustable brackets so the spectrum and intensity can be tweaked for plant growth and fish coloration. As the water finishes cycling with the help of seeded media and bottled bacteria, the creator explains how he tracks ammonia, nitrite, and nitrate, stressing that even a mega system can crash if patience isn’t observed.

The payoff arrives when the “coolest fish” finally move in. Viewers meet a show-stopping mix of species chosen for both compatibility and visual appeal: a vividly patterned flowerhorn that serves as the tank’s centerpiece, a trio of fast-moving clown loaches that patrol the bottom, a school of silver dollars for added motion in the midwater column, and a docile fire eel that snakes through caves at night. Each arrival is drip-acclimated to minimize stress, then released under dimmed lights to ease the transition. Feeding time highlights how the larger water volume stabilizes parameters and lets the fish eat with less competition, displaying brighter colors almost immediately.

In the closing moments, the creator offers a candid cost breakdown—materials, equipment, and livestock—while acknowledging that the real investment is ongoing care. He outlines a weekly maintenance routine of partial water changes, filter pad rinses, and parameter checks, and he invites subscribers to follow future updates on growth, behavior, and potential new tankmates. The project’s success, he concludes, proves that with careful planning, patience, and the right gear, a home hobbyist can build a mega fish tank that elevates both fish welfare and viewer enjoyment.

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