Sea Urchin

[peachy115]

Hi I Just purchased a Pencil Urchin
It is great but there is this thing on its back kinda looks like
a egg sack not sure the lady i got it from said that its has been there for some time now like 4 weeks does any one know if it
is having babies? And how long does that take? Do i have to watch the fish dont eat them?
Thank You:joy:

 

[joker_ca]

form what i remember from bio they release their eggs into the water column
my long spine urchin some times (mostly in summer during full moons) climbs to the top of the tank and lets his special little guys go