Join Date: Jan 2006
Location: Burnaby, BC, Canada
I just the regular outlet on my FX5 without problems and I have a fairly large bioload (big SA cichlids and silver dollars). I also mist CO2. Never had an oxygen problem, but then, my tank is only moderately planted. I also have an Eheim 2028 with a spraybar on the other side (But the holes are pointed parallel to the water surface, not up). I just aim one outlet up, and the other one down.
In the FX5, I do not use floss, as it would slow the flow to much (mine is in a 125 gallon). I used Biomax, potscrubbers, and activated charcoal in the 3 baskets. Cleaned it for the first time in 4 months last week, and boy, does that foam catch a lot of stuff.
Overall, I have no complaints about the filter and its usage. The only thing I have observed is that it does seem to trap a lot of air. If not for the 24 hour stop and restart, I think that thing would eventually develop an airlock.
Filstar pimp #59 (shhhh on the Eheim)