Escapees!
I feel your pain Soakley! Last year we had a similar problem. They kept escaping from the basket. First 1 would escape and I'd put them back, then it was 2-5, then finally I opened up the tank to see 19 swimming around happy as can be. Then when I released them all, we kept the incubation basket because we had a crooked spine fish (have another one this year) and the fish kept going back into the incubation basket!