Yeah, I'm trying what to do about filtration on this 100 gallon. It came with a really big filter of some sort. I'm not sure what it is or how to hook it up. It's about the size of a 10 gallon tank, but it's metal. I'll try and take a picture of it and post it. It looks impressive but I've never seen one. It might be too strong of a current for the fish that are going in there.