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it's not a great picture, but it *looks* like aiptasia. could be a hydroid, but i'm leaning towards aiptasia.
either way, don't throw it out. hopefully that other poster was joking. i can't tell if it's on a frag plug or not. if it is, maybe you can pop the zoas off the plug. you might get lucky and the aiptasia is left behind on the plug. then let the plug dry out and scrape it clean or soak it in RO or vinegar or peroxide.
or, you can just get a big heaping glob of superglue gel and smother it. make sure it is completely covered, with no gaps to wiggle through. use a toothpick to get the glue into the crevices and nooks and crannies. that's worked for me on small/baby aiptasia that i've found on frags.
good luck!