Well right out the gate i'm glad your trying to rescue these poor ball pythons. On one end i'm glad your taking them in but on the other i get kinda angered reading about neglect or abuse cases like these. It bugs me to think a lot of these people are probably loved or respected and they threat other living things this way. Now to the ball pythons i'm under the impression that their together in one tank which ain't good BUT i do understand your waiting for money so i guess it'll have to do for now. I'm not sure if you should keep bathing and handling them every day cause it could really stress them out to where your doing more harm then good. I would get some prevent a mite or similar product and threat the tank til you go to the vet and you get money to separate them. You also say you don't want to do anything toxic pam isn't that bad and there are natural alternatives also someone else is gonna have to tell what they are cause i use pam though luckily i haven't needed it for the last two years thankfully. The yb spider and normal male don't seem way bad but also in certain need of attention. Now the third is a supposed spinner if true spider could be behind the neuro issues but this sounds real bad. At this point i wouldn't waste my time believing anything this previous owner says about how any of these problems occurred especially stating the poor spinner just started this behavior. Back to trying to help them feel more comfortable. I suppose give them water a couple hides or places to hide. 90 degrees seems like an ok base temp. I'm guessing you don't have a thermostat gonna need one of those. When you get money i'd get some sterilite tubes. Go online or wall mart. The wall mart by me had a pretty decent selection of sizes. Get whats appropriate for there sizes. Then i'd get some 3 and or 6 inch heat tape from likely a site reptile basics is one of many. Get the thermostat hook up the heat tape and use it for all the tubes. Of course that's if you have the room or try to improvise something. Cause of the mites paper or paper towls are probably best to lay in the tubes or your current tank. I guess for now just keep an eye on them for any changes in behavior stuff like that till the vet. I'm sure the vet and other posters are and will fill you in more. I hope my suggestions help you in a good direction. Wishing for the best for all three of these ball pythons.