I culture
Tigriopus californicus. They will mostly occupy substrate, but are known to swim in the water column. Fish aren't the only animals that eat them. Tube worms, anemones, soft corals, SPS corals, LPS corals and larger zooplankton will consume them. They will do best in a refugium, especially with macro algae, but that doesn't mean they will thrive. Keep in mind that a small mandarin dragonet can eat well over 2,000 copepods a day, so that level of predation can keep a copepod population from succeeding; however, if you are feeding phytoplankton or have such a large system that the mandarin can't possibly comb the entire tank in a day, then the copepods have a chance to keep a population going. In the end, every tank is different, so we all do our best, right?
Chad