wow a sea urchin!!!!!!!!!!

i got a rock half covered with green zoas and guess what. there was a sea urchin the size of an inch on it in. as soon as i turned of the lights, the urchin ran loose and is now hiding somewhere in the 12 gallon of water i have on my desk. should i hunt him down and flush flush flush or should i keep this sexy urchin. i also have a very tiny mantis shrimp hiding somewhere, but im hoping he will die soon.

if it is a mantis it will not die it will probally kill everything else. try to get a pic if you can, urchins are good algae grazers i would keep it.

Since the urchin is small, I'd keep it, but try to trade it to the LFS when it gets bigger.

Your biggest worry is the mantis.It could cause more trouble than the urchin.
Just watch the urchin.You'll be surprised at just how fast they grow.I found a tiny(barely 1/4inch)long spine a couple of months ago.Now he's close to 1&1/4".

Hang on to the free hitchhiker I would say.

Your mantis will not die, as you hope. Those buggers are survivors.

They are actually worse than kenya weeds when your trying to kill them.