Im using a fluval fx5 for filtration, will need a second one soon as the fish are getting bigger. The tree needed cleaning, so I took it out. It was only temporary anyways until I get some driftwood, and rocks. I have a silver arro, common pleco, bala shark, irridescent shark, lima shovelnose, tiger shovelnose, and two red claw lobsters. I have a giant puffer, and a clown knife also going in when they get a little bigger.