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Did you say what macroalgae you have? Some are more efficient than others, both in terms of growth rate and tolerance to resource limitations. Chateo and Codium are both decent growers in a variety of environments. I bet a sump could be fairly packed and you'd still get more than adequate growth rates out of them. Ulva tends to really be harmed by low light. If it's most caulerpa spp, you'll notice the "going sexual" phase, and the subsequent bleaching of the algae, in response to insufficient resources.