When I changed from a wet/dry system to an FX5, life got alot easier except for the loss of surface skimming in the overflow box. Now I am in the same boat as you with attempts to surface skim without losing my CO2 to the agitation of a surface spray bar or something. Would someone who has dealt with this give us some feedback here please? Many thanks. (Joe, I still have that design you talked me through at Larrys but I can't use a prefilter with it and so that keeps it out of the running for the 180.)
Best regards
Harriett