It took a little maneuvering but the sponge fits below the water line , I have the jbj 30 gallon rl and my evaporation is heavy duty and I don't have an ATO yet so every 2 or 3 days I have to add about a gallon of water. When the water gets low my skimmer makes a slurping noise.o_O Otherwise it's great. I had the tunze 9004 and returned it because of the bubbles. Not sure if this will help you, nice thread btw :DI'm trying to avoid buying their bubble diffuser, I don't think it'll fit in the back of my tank.
Does the bubble diffuser sit above the waterline, or is it completely submerged, or somewhere in between?
Thanks for the reply!
