Hi there and welcome to AA!
Have you finished cycling your tank? At 7 weeks, i would think so; but just want to make sure you understand the salt water nitrogen cycle.
See here for a great explanation:
The (almost) Complete Guide and FAQ to Fishless Cycling
If you've tested your tank and it can turn your ammonia to nitrates within 24 hours, then your tank is cycled.
Also, I noticed you're using 25 lbs of rock. I'd heavily consider using more. Most SW
tanks have between 1-1.5lbs of rock per gallon. Live rock is the best filtration for salt water tanks. How have your water parameters been with the bioload you have?
TBH i'd think about getting more rock before adding more fish.