Super awesome looking tank man and the growth in there is amazing. When was the last time you did a water change? I was doing water changes every 6 months or so but I now do them once a month just to mix things up a bit. My corals do very well and there is great growth too.
I used to use tap water for a few years too but have been getting water from Safeway for the last couple of years. Everything did well but there used to be some diatoms on the sand. They went away as soon as I started using water from Safeway. By the way, I have the same size tank but don't run a skimmer and I use MH+T5 combo instead of just T5s.
Cheers
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