Eeeekkkk!!! Found a Zoo Spider (Pycnogonid) in my Tank!!

[ConcreteReefer]

I got him!! but if I caught/saw one, how many more do you think there are?? (sorry for the blurry pic-this thing is t-i-n-y)
My zoo's seem to be ok, no sign of distress.

 

[ConcreteReefer]

Mods- Can you please move to "zoanthids"