A couple of years ago I bought an Aquatop 400 canister filter which I have totally filled with API BioChem stars and my mechanical filtration comes from prefilter sponges which I squeeze out in tank water every week. It has been running great, dead silent, ever since, and my ammonia and nitrite have remained at 0 despite having a heavily stocked tank. It has a UV light chamber but I never use that. I really like the controls it has on the intake and outtake hoses where they loop over the tank edge but I've not seen this feature while trying to look up the filter and have found little other information about it. I bought it at a LFS when I was restarting fish keeping and needed a canister filter and it was the only one they had at the time.