Aio tank start up

[sergifed91]

I'm working on building a 20 gallon aio. I'm buying sand and everything else for the setup of the tank. But plan on using the rocks in my sump. Do I still need to cycle the tank?

 

[whalewhalewhale]

From my experience, starting off with live rock only experiences a "mini cycle", but if you want to add fish day 1, just add a little bit of prime in with them. I've noticed that ammonia/nitrite only blips then disappears quickly since the bacteria population is already there.