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A popular choice for refugium macroalgae among advanced aquarists in the United States is Chaetomorpha. Unlike Caulerpa, Chaetomorpha is multicellular and, as such, is inherently more stable. It can be cut and pruned aggressively with little or no fear of toxins being released or having vegetative crashes. And, like its namesake, it can also simply be thinned gently with ease like strands of spaghetti noodles. It is fast growing and makes an excellent vehicle for nutrient export! It is also highly adaptable to a very wide range of lighting [Tip: illuminate most macroalgae in refugia with at least 1 watt of light per liter of water at depths less than 30 cm]. Like most “vegetable-filter” algae species, moderate to strong water flow is necessary; keep a total water flow of at least 20X turnover of the volume of the culturing vessel.