I have couple small frags of this easy SPS - feel free to stop by and grab it. Really easy and beautiful coral - grown from half-inch frag to the tennis-size colony. Unfortunately some snail dropped it.
The amphidium strain doesn’t bubble - looks very similar to cyano or diatoms. Only microscope will tell exactly what it is.
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Been there, done that - most likely dino amphidium. It sticks to sand and hides at night.
Do you see it on the sand only? Siphon it out - sand is cheap!
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