Hydroids Pest

pisces 12

New member
Ok so i have these hydroids that are very short they look like green turf algae until you look close , there green in color and are starting to spread all over my rockwork but in small patches any ideas on getting rid of them pulling the rock not an option, some say hydrogen peroxide, some say Joe's juice or F aptasia, or reef two part puddy is there anything that will eat them my CBB doesn't seem interested, was thinking of a pin cushion urchins any input zis greatly appreciate
 
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