Royston,
It's amazing your list of corals is long and yet there is space in the tank to add more corals!
Do you run an external canister filter only because there is no mention of it anywhere? Is there enough flow in the tank?
Do you get algae on your satellite box because mine has an unsightly film at the inlet, walls, base and outlet? If yes, how often do you clean it? How long do you turn the lights on for your refugium?
I used to have 10 Sexy Shrimps for about 3 months but they disappeared altogether within a few days.