I've got an API Filstar XPS, which filters 250 gph, with a pretty heavy bi load, plus an Aqua Top sponge filter. The problem I'm having is that the XPS has a very strong current from the output. Some of the fish enjoy it, but most don't (especially the hatchet fish). I can't figure out how to modify the flow level. I tried a spray bar, but the water coming out made a strong current all the way across the top of the tank, no matter how I positioned the holes. That whole time I literally had bottom-dwelling hatchet fish! Right now I have a small snip of ammonia-reducing filter floss in the output: But all it does is split the current, so now there are two strong ones. Maybe a pot scrubber would help? Or stuffing some actual filter floss in the tube leading to the vent? I'm nervous about putting anything over the input, because I need a high level of gph, but if it won't reduce the filtration capacity, then absolutely I'll try it. Ideally I think something like a pot scrubber, but how would I attach it?