Right now I have a 2.5 gallon tank, but my fish are outgrowing it so I am considering upgrading to a 6.5 gallon tank. However I want to do this with minimal stress to the fish. How can I ensure that as much of the beneficial bacteria from the old tank as possible goes into the new one? The new tank I am looking at has a built-in filter, so I won't be able to keep the same filter as the old tank. I have purchased a bottle of Nutrafin Cycle, but does it actually instantly cycle the tank?
Also, I currently have 1-week-old molly fry in the tank right now. What age should they be before I change the tank?
Thank you :)
Upgrading to a bigger tank- a few questions
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