The tanks are not big enough for oscars. Unless you were cleaning those tanks daily, and even then keeping a small oscar tank 'clean and healthy' would have been impossible. Oscars are absolutely filthy beasts, need large tanks and the absolute in filtration
The albino is stunted, small tank, being bullied and not enough food i suspect
You are doing you fish a disservice by keeping them in such small tanks, they need to be rehomed and size appropriate fish bought to replace then
Dog~ Nika (f)
Cats~Scamp (m) & Simvar (m)
Fish~Tropicals & Goldies
RIP Scooby doo & Louise