I have a 55 gal
molly tank with guppys. I get tons of babys i give away or to my fish store. Some nice ones i keep for breeding. I have plastic and live plants i like to mix them in.
I never use a breeder box all my babys died i think it stresses them out. You need alot more plants. Try to get some live ones.
Mine started breeding like wild once i did and the babys hide as well as eat some of the water weeds i float. And i have moss for them to hide in. I hope you try some more plants and some live ones too.