Get a lot of plastic and live plants put them in the rocks and float them at the top give them hiding spots. I have tons of fry in with my adult fish and my fry count is growing at this very moment my larger guppy fry are surrounding the little newborn fry like they are guarding them and whenever a big one comes near they chase it off. It is interesting to watch. I have a ton of plants in my tank and the fry are doing just fine. I tried the breeding net thing but I couldn't tell which fish was having fry so I gave up and got the plants. as long as the fish are fed less food at a feeding but more times per day the fry will be ok. I can tell when my fish are hungry be how they act when I walk by I also throw in some fry food for all the other fish to eat while i suspect one is giving birth (sometimes I figure out who is having fry that way) It kind of seems to divert attention away from mom and also feeds any hiding babies. Good luck.