Mojano or Zoo?

[cdangel0]

OK, stupid question I guess, but when they're only the size of a dime how can you tell the difference between Mojano and a little Zoo?

They all seem to look alike. I have a couple growing randomly throughout my tank, the guy i bought my rock from said he had a lot of zoos - so I'm hoping that they're just starting to grow again.

Is there any definite way to tell?

(No pic - bow front tank not condusive to photography)

 

[frederickk]

Are they retracting very fast when you approach them?

 

[cdangel0]

They close up, not sure I'd call it retracting though.

 

[frederickk]

If they close up really fast chance are it is manjanos