If you see 5 or 6 there are probably many many more. You can use a turkey baster to siphon them off when you see them or take the whole rock and give it a freshwater dip for a few minutes. Use RO water, warm it up to tank temp, add a little baking soda or pH adjuster to it. Shake it around in the freshwater then drop it back in the tank. Might be unhappy for a while but it'll recover.
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