is this overkill

Overkill for what? A SPS tank, no. A FO tank, probably...

Need more info to tell you if it's overkill or not.
 
I have similar lighting on a 46 gallon,the only thing to watch for is the heat,such a small volume of water will heat up quickly especially in summer.
 
i am also running t4 pump and holy flow temp right now is between 80 83 depending on time i will be putting fans in there when the other mh goes in when the new bulbs come in i cant wait
 
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