Upgrading tank.

[Justin0329]

So currently I have a 55 that has been up and running for about 10 months. Due to the requirements of my current stock I am being forced to get a larger tank. I am looking at a 180 or larger. Probably a 210. Anyways, if I am using the same substrate and rock that is in my currently established tank and add dry substrate and rock that would be needed, should I still expect a cycle. I'm thinking that if I'm not adding anything with die off, I shouldn't have a problem. That the current BB will just expand to the new rock and sand. Is this true?

 

[Wendy68]

Just switched from a 67 to a 90 and it did cycle. With the amount of new water needed it was impossible to avoid even with the established rock, etc. Did not take as long as start up but... Keep a close eye on it.