Hi Stu, what fry and other fish do you have???
Sorry, it's guppy fry, i didn't read the heading!!!. Is it only guppies in the tank???
The general rule is, if they are small enough to fit in other fishes mouths, then they'll be eaten. The tetra's and gourami's will probably chase them, when introduced but if they are big enough, they'll be fine. It's a tricky one to call. Have you got any pic's of the fry??
If your not sure, then i would leave them.....
Imo, it really depends on a few factors, how big the parents are, feeding habits, food-amounts and type, temp of water. I currently have 60 guppy fry. They were all born within 3 days of each other, from 2 mothers. One mother is pretty big and the other is small. The big females fry are a lot bigger than the smaller mothers fry. I feed them both the same, they're in their own tank. It might be worth looking into a small tank for them, if you plan on actively breeding them. A small 20-30ltr tank would be ideal for them until you sale/trade them. I have mine in a 60ltr until they're big enough to trade to my lfs.....
