All new to me

Hi all. Been reading a few forums here and thought I'd join to get help where needed. I'm new to marine but had tropical for long long time. ( not that will help me here lol )
So I got a 8ft -12" 18" tank with sump 325litres or 65gall ,50 kg live rock dt1516 skimmer , couple of powerheads and a canister filter , 1" sand bed
Live rock came with some kinda corals on it ( no idea what they are yet )
6 cerith
6 Nass
2 nit
2 bumblebee
2 trouch
4 red hermit
3 cleaner shrimp
1 peppermint
Is clean up crew so far