I've had a few FBTs die a year ago in a tank, two survived. I removed them from that tank and used vineger to clean in. I put my axolotl in their for a couple weeks while I was resetting his tank up. Two or three weeks ago I put my surviving two FBTs in it. Today, I found one dead and one died in my hand. Both having the same symptoms as the previous frogs. I'd like a proper diagnosis, but I'm assuming it's chytrid. I'll put some links below.

The already deceased frog:
https://instagram.com/p/9piig6x0l7/
https://instagram.com/p/9pihXRR0l2/
https://instagram.com/p/9piggJR0l1/
https://instagram.com/p/9piesnx0lw/
https://instagram.com/p/9pidxpR0lu/

The frog that's dying (currently dead):
https://instagram.com/p/9pic_cR0lt/
https://instagram.com/p/9picivR0ls/
https://instagram.com/p/9pibb9R0lq/