Hi all! I've been following the forum for a month or so now while I've been purchasing all my equipment and getting set up. I finally started pluming my tank this week and I've got most of it set up. Filled the tank yesterday and when I started getting everything up and running I ran into a problem with the overflow box. It's an eshopps pf800 overflow box and I have a small drip coming from the bulkhead on the overflow box. I tightened it by hand as the instructions say but there is still a small drip coming out underneath. Wasn't sure if I should tighten it further with a wrench or if that will risk cracking it? Any suggestions?