i only have an emporer power filter that hangs on the back of the tank. It has two "bio wheels" as they call it, that the water gets sprayed onto and turns them like a water wheel. I believe this is called a power filter. I use to use i for my fresh water setup and now i use it for the SW
setup. Remarkably, the Pearlscape has somehow gotten better in the last hour. He's swimming more upright and seems like he's coming around. I don't know what's going to happen. The gash on his side is hard for me to tell what happened. I think he might have ran into something. I really doubt it's an ammonia burn. The only other thing it could be is some kind of infection/parasite i suppose. But i really can't get a good look at it since it's pretty small and hard to tell what exactly happnened. I hope he pulls through.