Is this good algae? ID PLEASE

[-=James=-]

I bought some used rock off someone and half of it was from their display tank, the other half has some hair algae from their sump, which I already stuck in a tub with a powerhead and heater.

1) Do I need to change the water that is in the tub? Or just leave it for a week then put the rock in the display tank after the algae dies? Should I scrub off the algae too? Should I be really concerned about algae?

-Or will it be ok to leave it in the tub for a week, scrub off any algae, then put it in my tank?


2) Is this algae on these rocks (pictured below)? These were from his display tank. If so, how should I go about cleaning them? Some rocks have purple coralline on it but is also covered with worms, brittlestars...how would I clean it?


All input is appreciated!!!