Its problobly just diatoms b/c the tank if pretty young, its normal for this to happen. They will go away quickly. If not you need to use only RO water for your changes & top offs, NO tapwater period. After a few small WC's it should clear up. And as already mentioned make sure you have enough flow, like 10x turnover minimum. Im sure its just diatoms though....
Escape
:happyfish