Could I get a little info on these inverts??

[Mr. Jake]

Hello there!

So not going to lie here I'm a little concerned about my father's reef tank. He started a tank last year in December, and after I considered it fish friendly. He went out and got a couple fish and a couple corals, threw them in the tank and called it good. I visit when I can but he never seems to do any maintenance so I've taken the burden of trying to keep it clean. But I've noticed one of the corals closed up and I'm pretty sure there's astrinia starfish (those little white ones) in the tank eating at it. I believe it's a GSP, but who knows. SPS maybe?
Anyhow my main question is, are there Sundial Snails too? I've read that Sundials need zoos to eat but maybe the coral is a zoo? (Doesn't look like any pictures of Zoos I've seen)
So all in all could I get some help here, there's hundreds of these little buggers and at least 50 of those white little stars.

 

[Lovemyreef2015]

I see collonista snails (good CUC) and asterina starfish. Some are known coral eaters. Some people will say they are good but I say 50/50. Not worth the risk.

 

[vetteguy53081]

get rid of stars. If in doubt- Chuck it out !!

 

[DSC reef]

Those look like collonista snails, there good guys.

 

[reef lover]

+1 on the stars and collonista...and yes i do believe thats gsp...very sad...but gsp