Transferring bacteria from old tank to new...
mooman said:
Edit: I should mention that if you already have a tank running, then there are very few instances where you should have to cycle another tank. Keep extra sponges in your existing filters. They will become colonized with bacteria and you can move them directly into a new tank. As long as you don't go crazy with stocking right off the bat, you should never have a problem.
This post from mooman is a few months old but says pretty much what I am wondering concerning my old 10g and new 75g. (There is no room however, to store a third sponge in my internal Fluval 2 Plus). After the new tank is set up with substrate, plants, lights, canister filter, heaters and the temperature of the new tank stabilizes, can I simply transfer my old (internal) filter, plants, gravel (top layer), and decos to the new tank, plus add the nine fish I have in the 10g? Will the danios and tetras be harmed by doing this instant transfer? I would run the internal filter for a month or so until the new filter has an established bacteria load. With this method could I start adding a fish or two a week or should I still wait the whole month to six weeks of cycling? I have the water testing equipment needed to check nitrite, nitrate, ammonia, and pH.
I have asked something like this question before but I don't understand the cycling theory enough to be comfortable with it. I don't see how I can keep the nine fish I have now in the 10g if I "steal" half their bacteria for the new tank. Won't this start a minicyle or worse for them? And wouldn't the new tank's bacteria die off unless I provided it with fish or dosed it with ammonia like the fishless cycle requires? Wouldn't it be better to transfer the whole tank rather than this 'half n half' idea? Of course, by canibalizing the 10g I leave myself with no quarantine tank for new fish, which becomes another problem.
Another question about transferred bacteria: Does one group these transferred items (gravel, old filter, decos, etc) around the intake tube of the new filter or spread everything around the tank?
Sometimes the twists and turns of my reasoning powers tire me out.
