We tried to just have a simple, passive cube tank, but the last fish didn’t make it (RIP Philippe). This time, there is a pump and a grow light, and the tank looks a damn sight better for it. So far, Darwin seems much more content with his surroundings and, thanks to Jacques and Cousteau the shrimp and Gumball and Gumbo the plek-type fishies, the tank has never been cleaner.