So I just got my tank set up yesterday..... and had a very slow leak on my return line....seemed to be at the connection to the bulkhead....the fitting that adapts the threaded bulkhead to a slip pvc fitting. Soooo, I tore it apart, replumbed, new fitting, xtra tape, same thing......Really slow leak. Day 2.....now I noticed the same thing from one of my drain lines. Now it’s not that urgent because it’s so slow and the drip falls into the sump....but still really aggravating. Any suggestions to fix this?