Questions - Need some input

Despite all efforts to deal with the hair algae I had in tank from previous owner i was fighting a losing battle so took the huge step of closing down the tank.

The live rock is cleaned and in a container with a powerhead and heater and so is the sand, the coral and fish went to a fellow reefer.

I have since stripped the red sea max down thoroughly cleaning the power heads and skimmer (not a nice job as was filthy and covered in scale - which meant the previous owner had ...