I wouldn't even add the phyto, and make sure you're doing water changes. If your water quality really was good, your stuff would grow. What is your water change schedule? You say you plan on 5-7 gallons every two weeks, but the tak is 6 months old. So what have you been doing so far? The lighting is fine for what you have, so it should be growing. Ca consumption is pretty minimal for those corals also, so I'd watch how much kalk was used. Right now the Ca is more than fine.
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Brad
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