I've heard a lot of newer subtank users say this. Where is it leaking from? The AFC or around d the glass? Admittedly I have 2 from the v1 lot and never had any leaks. Leaking seems to be down to a handful of things. Either the juice is too thin and flooding out the atty (use 50/50 up to 70vg), the o rings aren't making a seal (take em out, clean them and reinsert or replace with the spares and make sure everything is tightened down) or the wicking in the rba is inadequate. Don't know what more to suggest really as I say it's the most reliable tank in my collection so it's disappointing that new buyers seem to be having a rough time of it.