So I currently have a 20g long aqueon with around 20lb of live rock for a little over a year. Im now going to get a relatives IM 25g lagoon. I’ve never done a swap but I understand about separating everything in tubs and either replacing the sand or rinsing really well. What I’m not sure about is how much live rock do I need to transfer over if I would like to make a new aquascape with new dullest Marco rock?