Frogs can be very agile they can actually get in some pretty tight spaces. They will grow at different rates. The sex of the frog can also be a factor. And a grown frog would definently try to get into that cage to feed on the smaller ones depending on the species of course. they may also morphe at different times as well an american bullfrog tadpole can morphe in a matter of a few weeks but depending on the temp of the water it may take 2 years for them to morph. I have no idea if that has anything to do with the species you have there but it is always something to keep in mind. But from the sound of it, it is pretty warm where you are so they should be morphing pretty quickly and you will have a varity of sizes. They will be on the dinner menu for the larger frogs in your area. Can you take close up picks of the morphed frogs?