Hey glad to hear this guy doing better already, if he took one from the tongs next time you feed I wouldn't just let the crickets go and try to feed them by the tongs. All though eco earth can be passed you don't want him eating to much of it, you don't want him to become impacted from it and you don't want him filling up on eco earth and then not wanting to eat his bugs. Even though eco earth is made to be able to pass sometimes if they eat large amounts it will give him a mild impaction, but nothing a good old honey bath cant take care of. I would try the roaches, from what I have heard they are better then crickets nutrition wise. And if he's a juvenile I would get some nightcrawlers ( big worms) and feed him those, if they are really long you can cut them in half. Once you feed nightcrawlers you will notice his growth rate will really speed up. He should come back up on his own, if he doesn't for a day or 2 I wouldn't worry to much because this is his way of making himself feel secure. After lets say 2 days if he doesn't then I would unbury him to check on him. Once you know he's doing ok and he's grown abit you should be able to put him in his permanent home, I would give a month tops. If he keeps eating he will grow a lot within a month. A little trick when tong feeding is to rub the food item under his bottom lip, this triggers there feeding response most the time and once he's eaten one they usually keep going.