what exactly does it do? I've had six offsprings and they were all the same, with the grouper in the tank...

You might want to have a look at the Fish Tycoon Guide . And the fish has to be in the tank, to take affect.

it's in the tank. it says that "With this fish in your tank, pregnant fish have a chance of producing a baby not related to either parent! "
is it cause the possibilities are slim? or am i just having bad luck?

that makes 9 offsprings now and they're all the same

Well... I think it just comes by random when you get the Wasp Grouper. Do you have the magic fish of fertility in your tank(s).

ok gotcha, so there's no real percentage of chance involved, it just oscillates randomly?

I'm guessing so...

The Wasp Grouper affects a small percentage of babies. If you are breeding only a few fish, you will see not see a lot of mutations.

ok.... it's been 22 babies now. All from the same type of fish (golden guppy) and they are ALL Golden Guppies. Isn't 20 a lot for there not to be mutation already?

at least i'm making loads of money though :))

Well 20 is a tank full, so yeah, it should of mutated them.

right, i've been breeding them in one tank with about 4 pregnant golden guppies plus the grouper and the greenfin Spotanus in it. So about 12 babies twice...