Hi all I’ve recently cycled my reef and my water parameters are starting to settle I have been experiencing some brown algae on the surface of my tank and the substrate has been turning a brown colour only a day or so after cleaning I’ve read it could be diatoms but not quite sure if that’s the case I’m currently running 3 tsp of rowaphas in me 52l tank it hasn’t seemed to takle it much can someone please tell me if it’s just diatoms and if so the best way to get rid of it cheers.