leak tank

Hi guys! A few days ago I bought a new tank, so I've been working on plumbing it for the past few days the emergency PVC pipe is leaking and I just can't find a way to fix it, it is leaking from the top of it where it connects to the overflow box, I already added Teflon tape, and the leak...

Hi, My tank is 15 months old and started leaking last week. The aquarium builder is building another tank as we speak but he originally used black silicone. The bottom front glass is leaking and has a 3 inch flat glass with silicone over it. I took pictures of the black silicone with what...