Got these with a frag, brittle star and maybe its spawn?

I bought a frag from my lfs, upon cleaning I persuaded a brittle star to come out. I pulled of 3 small water spider lookin things, their like a translucent white with 8 legs. im not putting these back in my tank because I saw something on saltwater spiders and I don't even like regular spiders unless their the size of a tarantula. the tank I got this frag from had a whole buncha bubble algae of big green sorts and small hba. hopefully I got it all.



I tried googling the serpent star but there are a lot of species.. how can I persuade this guy to make its home in the sand vrs a tight crevice in the rock in my dual 55? he sure is cool to look at and should be the sands eye catcher.



enjoy some pics..