SOme people here on MFK are just as bad or even worse at times with giving advice. Not everyone on MFK is an expert. Its always best to get several opinions, PLUS reseach on the web. Searching on google helps alot.
Sorry to hear you're sick PP. I had looked at keeping eels at one time and decided against it because most need a fairly large tank. If you want something that looks like an eel and could be kept with a dwarf puffer, look at getting a couple kuhli loaches- I keep them with some of my puffers and the puffers leave them alone. Kuhlis won't eat the dwarf puffers and are not likely to be nipped by the puffers.