Hi,
The tank size, and emphasis on a hideaway, fresh water, and climbing branch all sound good. However, I would probably recommend a different type of bedding. Gravel has never worked well for me with the smaller species of snakes. I woud say that the substrate of choice would be either moist, additive-free potting soil, or cypress mulch with a small pile of moist sphagnum moss. My brown snake habitat has a substrate of dry cypress mulch, with a small flower pot that looks like a stump, embedded into the mulch, and filled with moist soil and worms.
You certainly have not at all had the snake long enough to start worrying; it sounds just the right size. You may never witness the snake eating (although that is quite unlikely), but it will most likely find the worms and devour them as they are added. It sounds as if you are doing a very good job.
P.S. ... ringnecks rule!
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DAVE
1.0 Western green toad
1.1 green treefrogs
1.0 Florida blue garter snake
1.1 Oriental fire-bellied toads
1.0 American bullfrog
0.1 Spanish ribbed newt
0.0.1 Eastern ribbon snake
1.1 red-cheeked mud turtles
0.1 Dubia day gecko
1.0 Sonoran gopher snake
0.1 rough green snakes
1.1 giant African black millipedes
1.0 Okeetee corn snake
0.1 Albino African clawed frog
1.0 Kenyan sand boa
0.0.1 Argentine flame-bellied toadlet
0.0.1 African bullfrog
1.0 yellow * Everglades rat snake intergrade
1.1 Western hognose snakes
1.2 fire salamanders
1.0 scarlet kingsnake
0.0.1 Argentine horned frog
0.1 Southern ringneck snakes
1.0 Florida scarletsnake
0.0.1 Florida brown snake
0.0.1 Northern brown snake
0.0.1 Smooth earth snake
0.0.2 Western worm snakes
"And tons of garters and ribbons are being born in the reptile room this very minute..."