I had 55w PCs... They where fine on my 33, I supplemented them with a NO actinic.... then i went to 175w MH, I and the corals liked it a lot more... but now I’m on my way to 10,000k 250w HQI PFO ballast.
Food for thought how far does what type of light penetrate the water... and at that, how quickly dose the useful energy deplete...
Cheers!
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