I was absolutely horrified to read this. I am a high school intern at an exotic animal clinic, and I hope my perspective can give you a further understanding of why you should rethink your set up.
The #1 cause of disease in reptiles and amphibians is poor husbandry/diet. These three animals have vastly different requirements. You are looking at the possibility of severe and longterm respiratory and skin issues, among other things. Most check ups cost ~$80 USD, plus the cost of medication. If all three of those animals begin to struggle and develop health issues, you could easily be looking at over $200 in vet bills.
For your financial wellbeing and the wellbeing of these animals, I would separate them ASAP. If you cannot afford to do so, I recommend finding a local reptile rescue to give them to. I know it can be hard to give up your animals, but sometimes it is for the best.
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