If I upgrade from a 10 to a 20/29, can I just take all that is in the 10, including water, decorations, gravel, filter and put it in a 20/29 gallon along with the 20/29 filter and move the fish there? It would be kind of like doing a water change, but I want to be sure. It will be a new tank with old 10 gallon filter running as well as the new filter so the bacteria from the old is there, and the new can grow the bacteria.
I thought it might be best to cycle a new tank first and rinse the 10 gallon filter cartidge in the new tank and putting in stresszyme to help it along,
but someone told me that you can just move everything from the old and run both filters. Considering this person "knows everything about everything",
I am not sure. 
I thought it might be best to cycle a new tank first and rinse the 10 gallon filter cartidge in the new tank and putting in stresszyme to help it along,
I am not sure. 