I'm setting up a 30 long in a week or so and I'm going to put an HoB on my 75 so it gets a good amount of BB (beneficial bacteria) built up, plus I'll be adding rocks from my 75 which should add even more bb. Now I'm doing this so I can add fish right away, I'll still monitor water chemistry and do water changes if I see ANY ammonia or nitrite though. Now I want to get a good buildup of bb on my substrate as well so I'd like to add the rocks in a day ahead of time since I've heard healthy bb can double it's numbers in 24 hours. What I'm worried about is I'll be catching the fish for the tank with rod and reel (yes, it's going to be a native tank ) and if by some chance fishing is bad and I can't catch any fish (which almost never happens, I'm to pro a fisherman :ROFL) I'd go out the very next day and try again but I'm sure that the bb could live that long without an ammonia source. So in your experience how long can BB live without an ammonia source.