Yeah constant levels of calcium are very important with healthy coraline growth, as well as intensity of light, not the photo period.
I would get some better lights on there. I have a 7g Fluval Edge Nano with a 150W Metal Halide and LED suppliments... and I have pure purple rocks, with coraline growing over coraline. I also dose calcium into my ATO resevoir.
Do you have any corals in there yet? And have you done a water change since the setup?
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