I am not sure how, but I have twice as many as i started out with...I have purchased two, and now have four. I think they must have been hitch hiking on some rock I added...
They all get along well together though.
tw
I have 4 and still see only one at any given time <img src="graemlins//confused.gif" border="0" alt="[confused]" /> I guess I have too many hiding places. I guess I'll get another