how do i let the dark side take over?

[troni]

First off hello! So I'm done with freshwater. I have a 20g I'm turning into sw. I'm doing tons of research and getting rid of my freshwater stuff. I think I understand the setup process except one thing, should I completely clean the tank or just scrub off algae and fill up with sw? While I'm asking when buying previously loved LR what should I be cautious about? As much reading and looking that I've seen I haven't seen a LR cliff...lol like in nemo "the dropoff" I'm going to attempt this I think.