Originally Posted by Thomas712
For best results you should cycle the new tank. The old water will do almost nothing for you even though its established so to speak. It's the bacteria that is on everything in the tank, not the water, that you need. It is this bacteria that processes the water.
I've gone from a 55 to a 90 gallon. I personally cycled the 90 on its own first. Then added the rock and base rock from the 55. I changed substrates though. Depending on the condition of your current sand bed you may be able to use it, but it would be better if you could just start a new one.
How long has your old sand bed been established?
How deep is it?
Thomas
Just curious as to why it would be better to start with a new sand bed? I am guessing part of the reason is because the original sand would be disturbed so much by moving it to the new tank.
On the other hand, since you would be cycling the new tank, why would that matter? You would obviously have to add more sand to it anyway, so is it somewhat detrimental to combine the old with the new?