I get AMAZING growth in both caulerpa and chaeto!!!
I have a 20 gallon deep refugium lit by a cheap 175watt metal halide (4000K) I bought from Home Depot.
I have pretty much no water flow (maybe 5 gallons/hour). I do use air bubblers which create turbulent water movement in the fuge.
I had terrible growth before I upgraded to the MH light.
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