Teflon Tape! I have a mini vivi nova and as soon as I put juice in it, it started to leak out of the threading. My friends all have the larger one and the same thing with those too, leaking from the threads. I also heard a few of you on here saying the same thing. Well I happened to have some teflon tape here so I cleaned my tank and wiped off the threads really good, wrapped the threading tightly (on the tube part) about 3 times around with the teflon tape and its now sit over night full of juice and not so much as a drop has leaked out. Teflon tape can be found at just about any hardware store. Give it a try!