Join Date: Oct 2002
Location: Wilmington, DE, USA/Philly, PA
I had the exact same problem with my Aquaclear ph...
I took the sponge out and 3 of my fish (at different times across 3 days) became stuck in the tube!!! I think the current attracted them (like salmon swimming up stream).
I took another gravel tube cap (the nipple between the wide stiff tubing and narrow flexible tubing), drilled a few holes around the main hole, and stuck it on the end of my current tube...works like a charm...and no rattling...