Kinda looks like a Penguin 280 power filter??? Might be a tad small for a 55. Might consider down the road adding another one or upgrading to a Emperor 400 for a 55.....or swap to a canister filter maybe. If your final tank has a healthy bioload, a 280 might be too small IMHO. Just personal experience, Fluval 305 canister filter works great with a 55 with a full stock.