So I purchased awhile back a small marineland 3G tank that is a all-in-one tank. I was housing a Betta in it and one snail. Well the Betta passed away, and shortly after the snail was acting weird and he just passed away too. I tested water (ammonia, nitrite, nitrates, ph, gh, kh) and honestly it wasn't bad at all. So I am confused what happened, maybe just old age who knows. But I want to give it a real good cleaning to get any contaminants out of it, then I will be storing it away till I want it back up or something. So what is best way? I was thinking hot water with some bleach and let it run? Probably toss the gravel? Driftwood I'm not sure if I should keep or toss? Any pointers I appreciate!