How large do the fry need to be before they can become tank members with the rest of our fish. They are in a holding net and we have not lost any as of yet, filled the bottom of the net with small gravel so the fish can not get to them, they have learnt to hit the deck if anything comes two close. How big would they need to be before they will not become food for the adult :fish: ??? They are just over one week old . Many thanks Gary.