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Help Please

paul horsman

Hi guys im new to keeping marine fish,So bare with me please,
ive got a small 90l tank with live rock and a sump and skimmer, tanks been running fine now for a week but yesterday i came home from work to find the live rock and sand covered in a greeny brown stuff, a friend told me it was nothing to worry about and that is would sort itself out.
Is this correct?
ive put one cleaning shrimp in and 2 crabs 5 hermits and some small snails which dont move alot to try clean it up.
is there anything i need to do?
my water all tests ok i think.
i would appreciate all your reply and time .