Im getting frustrated (feeding problem)

[tsshields]

I'd bump the 700 gram size up to 28/34 quart tubs and give them hides till they ate better, do you use hides now?
I only use them with slightly pickier snakes which it sounds like your qualify as...

You say the yb is 3 weeks old
You waited a week to feed it and no go so you waited 2 more weeks and no go.
Did you purchase an unfed brand new hatchling yb?

I use hides for all my snakes do you think i shouldnt? and I put the spider in the a 28qt and that is when he went off feed for like 3 to 4 months

The yb is 278g he has ate a ton but not with me i just got him about 3 weeks ago let me know what you think