When you say you "found" an earthworm - do you mean outside on your property? I do not recommend doing so again, the ground can hold on to chemicals such as fertilizers/pesticides for a LONG time and you can't track from where the worm waundered before you found it - so you don't know exactly what you could be exposing the frog too.
Earth worms are fine, but have a reliable source. I buy mine from a local bait shop but you can buy in bulk online and grow your own worm farm if you prefer.
Now, these frogs can go weeks with out eating if they have recently been stressed (such as being shipped to the pet store and then being carried in a bag to a new tank at your house) so don't be surprised if he doesn't eat. What you don't want to do, is throw a variety of foods at him. This will actually make feeding him harder in the long run as he will get spoiled. The HBH are a wonderful diet for them and with patience, they will eat them.
The stones might also trap some of the food, fouling the water. Bare bottomed or sand is easier with young frogs. Do not move him into a smaller tank, even temporarily this can hinder their growth because they won't physically want to outgrow their environment, so they stunt.
So enjoy your new little friend and be patient but firm. He has to eat what is best for him. Also, if you don't have one already - get a filter. These are massively dirty frogs and being fully aquatic, dirty water can make them sick. Google the "Nitrogen cycle for aquariums" to learn the importance of ammonia/nitrite/nitrate levels in the tank...if you are setting up a new filter then you are in a "Fish-in cycle" and read up about what it entails. Treat this system just like you would a fish tank as far as cycling and the importance of a cycled filter.
Here is a "Beginners" research area off of a fish forum I frequent that has a bunch of links to help you learn about the above topics.
Beginners Resource Center - Tropical Fish Forums





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I have since moved my snail to another home. My sister is quite enjoying it. I have also taken about half of the stones out of the tank, leaving my tank half bare. My frog seems to enjoy hiding among the rocks, so I left some. It is much easier to feed without them though! I've also caught on to sinking the HBH food. It does normally float.
