Hey y'all, so I have a 40 breeder. I want to eventually transfer all into a 75 gal (48x18x20) so I know I can transfer all the water. I've read I should buy new sand instead of using my old sand, my concern is will that cause another cycle in the tank. How bout adding new rock. I don't want to add my fish if it is. Another question is what's a good size sump? A 29gal or a 20 long? I'm using a Rapids Pro3 overflow box. Advise please.
