I just picked up a 47 gal column tank measuring 20”x18”x30” and was trying to find a lighting fixture suited for this tank. I will want to grow some dwarf hair grass that I have leftover from another tank and some Vals, Anubias, Ferns, etc..etc... I was thinking of keeping two or three Peacock Cichlids in here with various other compatible fish. A tank with these dimensions, how would one figure how much wattage and whathaveyou would work best?

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