Agreed with the above. Some people go nuts trying to get rid of diatoms because they're mildly unsightly, then end up with blooms of the much more problematic organisms the diatoms were out competing.
Diatoms are not always part of the process - However its common - do they disappear overnight and re-appear after the lights are on- you could try siphoning off the sand - and adding fresh saltwater thereafter. This should take care of cyano and diatoms. Many people will say 'cyano will grow with low nutrients' - another post the other day (I believe from triton) says if you have cyano, it is best to change water - so I don't want to enter that debate here. I'm not talking about huge amounts - just siphon your sand
Thank you everyone, they are not to terrible I will keep and eye on them. If they get way outta control I will revisit, but tank is only 2 months old so just wanted to be sure that I’m doing g things properly.