I honestly doubt its the T5's. I have overdriven T5's with individual reflectors. My monti cap grew about 1.5"-2" within 2-3 months. Not sure if thats fast or slow... I'd say thats decent growth, esp since for about a good 1 month there Mg was low at 1000. My cap is about midway up the tank though and has good flow from my Koralia 4's in my 90g.
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