So I have a 20 gallon long sump with a refugium and was interested in growing mangroves as a nutrient export... I would imagine it would work just like any other macroalgae. I have live rock in the refugium and would plant the mangroves there. I was thinking a clip on shop light with a grow bulb or the cannagrow led 100 watt and cycle that light on at night when tank lights are off.