I'm pretty sure I just forgot to tighten them all the way. I can be scatter brained like that. Hand tight was enough to stop the leak.Yeah, this is going to be a nice tank. I can’t wait to see how it looks with some color in it. My tank just delivered today. I started plumbing the return pump, but I need an adapter. Now you’ve got me second-guessing how tight I got my fittings - I have to go check that now - lol