Undergravel filter?
Hello. I have a 33 gallon fish tank with a heater, power filter, and an undergravel filter. I have never had trouble with the undergravel filter until just recently. I have found that the tube that holds the air stone keeps popping out, just one side though. When I push it back in it pops back out shortly after. I tried turning down the air flow, but that doesn't help. I have already lost two fish from being caught in the tube. What can I do to stop it from popping out? Has any one else had this problem? TIA