How far off the sandbed are your lights? If they are t5's you should probably just rest them on the rim of the tank - from what i read (could be wrong) t5's max out at a depth of 20-24".
The Powermodules have much higher PAR than all other t5ho fixtures so they still work well at those depths.
Reefgeek has 10% of this weekend on the sunpower models.
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