BP not Eating

[Bogertophis]

Details about Tank, 20 gal top opening tank, sides and back covered, Tank is in far back bedroom, no traffic except me. Cage set up, 1 large half log hide in middle with fake plant vines, large water dish in cool end. Average temperature in hot end between 85-90 degrees, humidity averages between 35-50%. Floor covered with Loose Coconut fiber on bottom with Natural Cypress Mulch on top. Light brown Terrarium Moss in corners and sides. For water i use Ice Mountain bottled. As for snake, Black Pastel female from Wilbanks reptiles, weight at purchase, 250g. Thx

Half log 'hides' are not adequate hides at all- they're nice cage furniture, but they don't offer what your BP needs- a real sense of security. Just as an example [ie. NOT a brand endorsement, though these are just fine, but similar ones available at beanfarm.com & other sources too] you want something like this: https://www.reptilebasics.com/medium-hide-box

They come in different sizes- pick the size your snake will fit fairly snugly into- BPs in the wild live in rock piles & such- they like to feel some "back pressure"- they want only one doorway that's JUST big enough for them to go thru after a meal is preferred.

Also: you need at least TWO equal hides, one on the cool side, & one on the warm side, because snakes will nearly always choose a sense of security over the proper temperature, so if their only hide is too cool for digestion, let's say, you may have a snake regurgitating their undigested dinner, or refusing to eat at all, just like yours is doing; even though heat is supplied, if they can't use it while feeling safe (in a proper hide) they're not going to thrive & digest well.

Snakes need to thermoregulate at all times, so if they don't have an unheated hide too, they'll probably end up dehydrated & burning thru more food & losing weight, because their metabolism is determined by their temperatures, & snakes are not designed to stay at the highest temperatures all the time either. Two or more hides (the right kind) are just essential at all times.

Also, if you have room, a third hide -a "humid hide" with damp moss etc.- is also a very helpful item to offer for good sheds & general comfort options. Your humidity is a bit too low- you want 50-60% on average, & a bit higher during shed.

The sooner you fix the "hide" situation, the faster your snake will finally feel safe enough to settle in & eat.

Since you're using a tank, FYI you'll need to cover* most of the screen top to cut down on air-flow- that's why the humidity is so low. If you have lots of room, putting the water bowl nearer to heat will raise the humidity a bit thru increased evaporation. The 2 hides are far more important than a large water bowl- for that matter, since snakes seldom soak, a humid hide is a better option too, with a smaller water bowl just for drinking.

*Some people use a piece of plexi, some use foil- many things work- just anything that air can't go thru. Leave gaps, of course, for some circulation- just not the whole screen top- not for a BP, anyway. Other snakes need lots of air circulation, but BPs need the humidity more.

You're almost "there"- you just need a few tweaks to get this right.