looks like you are having a diatom bloom which is good and it will go away as your tank cycles....your pH might be low due to your cycling....just make sure that you are around 1.023 or so specific gravity with the correct salt mix and sit on your hands for six weeks or more with regular water changes
also get a turkey blaster as you can just blow it off the rock when you clean your tank and do water changes....
just keep testing for ammonia which will go up then down followed by the same with nitrates, then nitrites...testing once a week is plenty, as the big thing you need right now is to just wait for the cycle to complete which can take 4-6 weeks or more