I've had my 90 gallon aqueon megaflow reef ready tank set up and cycling for a few week. This afternoon when I checked on my tank the durso standpipe was floating out of the bulkhead. I can't keep it from floating out without physically holding it down. Its never been that tight in the bulkhead. I have tried to pull out the durso standpipe and clean it with no change. I even removed the elbow from the top so it was just an open pipe at the top. No matter what when the overflow starts to fill back up (about 9 inches or so) the standpipe gets pushed out of the bulkhead,
Any ideas?
Any ideas?