Planted Tank Guru
Join Date: Feb 2010
Location: Newbury Park, CA
Never had any luck with the airline tube thing although I have one stuck in there at the moment! Try using the lever on the pump return to reduce the flow a little, that worked right away for me. Those surges are something. Adjusting the prefilter sponge helps with gurgles too.
Sumps are amazing, someday I will have them all figured out..............