He's started his metamorphasis and physical changes are happening with his head and eyes now too so they don't see as well as they did early on to follow their prey in the water. Once they start hunting on the bottom, you can try them with some daphnia but I highly reocmmend you do it the first time the day before water change in case they aren't into it yet. It can get messy on the bottom if they don't eat it.

todley