How much rock is that (lbs)? Looks a little light. I made the mistake of not putting enough rock in and now I have corals everywhere and it's really hard to add more. Makes it difficult in the future
I'd recommend adding it all at once. That way you don't see a new cycle when you add more. And it's easier to add before there are animals in there. You typically want 1lb per gallon of water to have enough to support the bioload. Just a tip that I personally experienced :)