Well, everyone on this website has some advice for taking care of your fish. But I have one thing to add. It might seem obvious, but these fish are fast and froggie- yesterday, I lost my cellophane giant down the drain during a water change. He leapt out of the container as he was being poured into his bowl and slid right out of sight. :( So, my advice: pour over buckets. Drains are very very dangerous, and as this should have been able to go unsaid, I wanted to do everyone else a favor and give them a chance to learn from my mistake.
So, as for the fish that went down the drain.... i lost my mind. I ripped the plumbing out of the walls with my bare hands, sobbing. He was already past the trap, though, and I lost it. Sobbing, I couldn't stop thinking about him dying in my septic tank. As I cried, after about 5 minutes, I heard a plop. He had flopped back towards the light, and come back out of the septic-side pipe. I picked him up, rinsed him, and stuck him in a methylene blue and neomycin sulphate hospital tank. Today, he looks as if nothing happened and is eating and flaring and swimming. His new name? Lazarus. happy ending, but GREAT lesson!