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The reason most of us say that coral needs a mature tank is beacuse the tank will have gone through the PH swings and levels of CA and Alk will be generally stable. Also a mature tank is going to have the biological filter to handle the bio load of the tank and keep the water parameters stable.
With SPS corals under PC lighting you will not get the intense colors you see in peoples tanks. SPS corals need that high light to maintain their color. I have PC lighting over my Frag tank and I only keep my SPS frags in there long enough for them to start encrusting on the plug or rock and then they are moved back into my display to color up for selling.
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