Injured Lionhead and Weird-acting oscar

Question
My orange lionhead was attacked by another fish in it's tank and some of its scales are missing. It is bleeding on the top, on the side, and on the tail. I don't know what to do. I seperated it from the other fish and put it in a 2 gallon tank. It stays at the bottom and doesn't move. I don't know what do do.

In a different tank, i have an oscar fish that sometimes swims on his side and stays at the bottom most of the time. This is really weird behaivour for him. Please tell me what to do.

Answer
Hi Stefan;

In the lionhead's tank, change all the water every day. It is so small that he may be affected by his own waste toxins. Goldfish make a ton of waste without even trying. Get some melafix and salt and use it in there for him, replacing it when you replace the water. Get an airstone hooked to an airpump for extra oxygen if the tank has no filter. Once the crisis is over he will need a ten gallon tank to live in permanently unless the attacking fish is no longer in the tank he used to live in. Poor guy. That happens sometimes.

Regarding the oscar;

Does he lay down after water was changed or is there anything else that precedes the behavior? overeating? Filter  cleaning? Does anyone tease him or tap on his tank?
How big is he?
How big is his tank?
How often is water changed?
Does the water temperature ever fluctuate?

At Your Service;
Chris Robbins