OMFG i found a spider in my tank

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i was lookn at my zoo frags checkn them for nudis that i found on them treated them havent seen any more found 1 pollip was eatn around base was fine last night noticed yellow wormy lookn thing on it upon furture inspect its a spider little yellow sucker pulled frag and put into a dish shoul i kill it or grow it into some kind freaky pet hav never seen on with my own eyes its finda freay lookn ill try postn a pic latet also how do they breed shoul i be worried since it is small like 3mm allmost munched the zoo of the rock in about 8 hours.dont want any more of these guys these 2 frags i got came with a whole lot of pests.