Are those tubs near the bottom? Sometimes temps can differ from top to bottom. What's are you heating with? Check all of your connections. They can easily get an RI if let's say those two girls were wintering themselves and have been staying on the coolside and your night time temps dropping and making it too cold for them at night and then they aren't getting warm enough during the day. But how they got the RI is not the issue at hand. I can't recommend a vet bc I'm way across the country. But a usual vet visit to my herp vet is at least 100-200$. They'll need antibiotics so that will cost, but its really the only way.