dude don't force feed, you're probably stressing him out, make sure you dont have too many crickets in there with him, don't mess with him, pretend like he's not even there, you can even hold off on feeding him for a day. But yeah the most important thing is space, and 5 gallons won't cut it, im sorry but its almost cruel. stress is very important too, you could try covering the tank up so he/she cant see you, keep it on there for a week or two. just remember to change water and mist(no tap or city, unless you have dechlorinator) and throw in a cricket or two every day, but make sure you check to see if the other ones are still in there, in that case don' t put anymore in. Try not to be anywhere near the tank, I know the frog looks asleep when u come up to it, but they can see everything. it's tempting, but don't do it. thats the only additional info i could spare