2 of them figured it out quite quickly. One other accidentally ate one off the floor, but didn't realise there were any other peas there. The other 2 still haven't clocked it. I've got an aquarium floor covered with peas
I've got 5 goldies, so I put in 20 peas. I hope that sounds about right. They're between 3-6 years old and so are pretty big fishies.