I have two cleaner shrimp & they'll roam around on the brown button polyps in my tank picking away. Doesn't seem to do any harm, the polyps close up & reopen later with no apparent damage done. Too bad almost, since these brown polyps are taking over too much of my LR. I also have a Hammer coral in the tank & I've never seen the shrimp on that. When my BTA was new & weak, the single shrimp I had at the time would steal chunks of silverside when I tried to feed it. Once the BTA coloured up & was healthier, the shrimp would no longer do that, he got stung. BTA has split many times since then, I now have 3 of them & the shrimp don't go near them. I'm certain if they got too close now they would get stung, eaten even.
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