There are a lot of AquaClear fans on this site. I'll get it started. AC30 all day. you can go 3-stage, or stack any combination of 3 media inserts. I run 2 mechanical foams & a Bio-Max bag. If you're cycling, they have an Ammonia absorber insert, too. That worked well for me...
I just hear bio-wheel, bio-wheel.. but the hagen/aquaclear equipment seem to be so much more versatile than the competition.. Is it considered more the professionals choice?
I have an AC 70 power head on the way for the 30g, but I think i'm leaning towards the AC atm..