What macroalgae species are good for the sump / refugium?
Assumed that a suitable light for macroalgae is already installed in the refugium / sump we would recommend the following marine
The most often macroalgae species as it is very easy to grow:
And if you like to create a planted refugium we do recommend the following Caulerpa species, which will need a bit more attention than Chaetomorpha as they can go sexual. See more about this here in the FAQ section.