Hey guys I know you guys can help me out with this!!!!! I just installed my bulkheads on my overflow (drilled 75 gallon) and it seems to be leaking from inside the bulkhead on the return line. Is this ok ? If not how can I fix. (Leaking very slow a drip every few minutes). I hand tightened them no wrench. Any help would be appreciated. Thanks in advance guys and gals.