I was offered 3 tinfoil barbs today and I have to get them this week if I want them which I do. The problem is I don't have a tank set up for them right now but i do have an empty 55. so how long would it take for me to get a filter established well enough with nitrifying bacteria if I let it run in one of my mature aquariums? because the tank i would let it run in has been going for 5 years now so it is ok. And then how long would I have to let the filter run in the new aquarium before I could actually put the barbs in there? Any helps is appreciated. Thanks in advance logo.