I bought like 15 or something cherries for my 30L tank like August last year, I think for some reason I only have like half left. However, I am extremely confused as to why they won't breed, they don't even look pregnant! I've got some paler ones, some strong red ones and a couple with like a pinky stripe down their back. The tank they live in is literally overgrown with moss! The fish in there are like 8 Green Neons, 6 Ottos and 1 Panda Cory. I know it's heavily stocked but people on here thought it was alright and it seems to be just that. Just wondering if there's any reason I don't have like 1 million cherry shrimps in my tank.