I use these they work great. I use the 300w ones. Btw I believe they are rated to mirror the x wattage, but do not actually consume the Watts advertised
I'm not sure, a few hundred probably. Maybe 300? The sump consists of 8 tanks all interconnected with bulkheads. We have chaeto in 4 of them, if I remember correctly. And mangroves in another.
I'm guessing that light will do just fine, and the chaeto could care less if the lights come on slowly or full blast.
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