You're going to fall in love with this little fish if he makes it! Especially knowing where he/she came from with those conditions. I had a similar situation, well, similar in that I'm certain I gave a Tiger Oscar a good home, but he was in a regular tank as he should have been but anyhow I was in Petsmart to pick up some Prime and I glanced over their tank section. I usually don't buy fish from chain stores but I always like to look. Anyhow, they were emptying out all of their tanks day by day to break them all down to remodel the set up. In one of the few remaining tanks with fish there was a lone Oscar. I've never kept an Oscar and quite frankly never had any interest in them.
Then I stopped and looked around and I thought to myself, this poor thing is going to be bought by someone who has no clue what they're doing and he'll prob end up dead. And as I'm looking at him I got a good look at his colors. He was largely plain with minimal patches of orange but had a bright orange ring around his false eye spot on his tail and I thought, wow he's cool looking. Almost looks as close to wild as it can get. And his personality was great. He just came over to the tank and stared at me, swimming around happily, looked healthy and just needed a good home.
I said, you know what... screw it, I'm gonna buy him, full well knowing he's going to need a big tank. I have a 130 gallon South American Cichlid tank that in the back of my mind could suffice in a pinch, but I had an empty 46 gallon cycled and sitting there so I said, hey, I'll save this guy and let him begin to grow out there.
Well I've got to tell you... this was the best thing I've ever done in fish keeping! He's growing quickly, and he knows me well now. He leaps out of the water and eats freeze dried shrimp right from my hand! Its awesome! He's crazy fun to watch and I love just spending time with him. I could watch this guy all day. I admit, I'm feeding him well because I want to see him get huge.
In the meantime, I bought him his own 75 gallon that he'll move to next and have to himself. After that, he can have the 130 if he needs it and I'll move some other fish around to accommodate. Down the road, I have a 220 gallon I will set up some day and he can be king of that tank. I can see why they're nicknamed 'the waterdog' now though and I totally understand why people love these fish now! They're like aquatic pups!