Convict Saved from Filthy Tank

I just got three convicts from the most disgusting tank that I've ever seen with living fish in it. Due to my tank situation, I probably shouldn't have taken any, but at least mine are clean!

The man's wife is the one who owns the fish, but she has been incarcerated since February. The convict tank has not been maintained sine then. I believe it's a 55gal long tank, by eyeballing it. The water level was a little higher than half way, and there were two long dead convicts floating that I saw, more that he took out. The sides were coated with brown, fluffy filth, as was the gravel on the bottom.

Two of the three I saved show very little markings and are pale and almost clear. Are they sick, and can they get my other fish sick? The other is bigger and looks more like a convict, but is still a little pale and translucent.

I will post pictures tomorrow night, as I do not have access to a digital camera until then, but if you can diagnose anything with information alone, please do. I'm going to go and clean the tank later this week, and I brought over water conditioner after I got the fish and added water. It was awful...

I want to keep one of them, but I might get attached and keep them all. That means upgrading to a bigger tank, though, so I don't know if I can...

Okay, the biggest convict died for reasons unapparent, and the smallest I found on the floor, dried up and dead one morning, so I'm down to one. :thumbsdown:Ammonia and nitrites are fine, and the remaining is looking very good. It's getting a lot of color and starting to stripe-up! It's really cute, and I can't wait to put it in my 110gal!

lol, sorry, I forgot. Here you go!