snail outbreak collonista or sundial?

[daweedski]

I have this outbreak mostly come out at night, are these sundial or collonista? I had two zoanthid colonies die in the past 3 months but that may be due to lighting. Is it safe to put a clam in, It is in qt rn and I am getting lighting before I would put it in.

 

[650-IS350]

sundial

http://www.zoaid.com/index.php?module=Gallery2&g2_itemId=424

looks like colonista,, google for more pictures.