idk how it'd go on a reef tank, but i use one on my 40 breeder observation tank. seems to work pretty well, comes with seachem matrix which is nice. it seems to clean the surface pretty well? but can't say for sure since i have a lot of random powerheads hanging around, so i have 2 in there, the surface agitation is quite a bit with them.
i have another HOB filter on another QT tank and that thing is LOUD. the seachem one is really quiet
i have another HOB filter on another QT tank and that thing is LOUD. the seachem one is really quiet

