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My zoas grow very fast tripled in about 2 months time, my GSP doesn't seem to do as well in my tanks it could be because of water flow being to strong. My xenia is taking over things.
GSP will grow like weeds if they do well. Zoa's will take a while to get established. When they do start to spread, you may see a new polyp or two every 3 days or so IME.