Hi jake try and get us some closer pictures of the axies it might help us a lot to see if there are any other things wrong.
I thought my axy was going to die and i read gravel could hurt their belly, thought it was rubbish, replaced gravel with sand and she pooped out some gravel! and didnt eat until she passed it all.
Id say keep the lights off, no matter how bright or dim it is when axies are unwell they prefer dark spaces like any other animal to keep them calm, id really try that!
I see your wild type is awfully skinny, im just adopting a really skinny one from a shop and im going to try and fatten him up, if i have any luck i can take him on for you or give you some advice on what i did that worked?
Your other axies dont look that bad to be perfectly honest, i cant see them that well, i reckon sand no light for a while if they are acting stressed and keep water quality to its best!
Get us some more pictures and if you struggle with the wild type and i end up getting my skinny one which is skinnier than yours back to health i can take your one on for you.
Try the sand see if they poop out gravel i was surprised when mine did
x BEST OF LUCK X PM me if you want to talk about rehoming the skinny guy Id happily take on the other ones, but they dont look too unhealthy and i think you have got a good chance of getting them back on their feet again x