I wouldn't add an Oscar in a 55 gallon. Oscars get 12-13 inches or so I believe. The width on 55 gallons are 12-13 inches I think, so it will have a hard time turning in the tank. I think a 75 would be better for an Oscar. The Oscar would probably eat the tiger barbs
Agreed! 75 for 1 oscar! If you stick an oscar in a 55 sever stunting could occur.
More than 10 years
Yes, barbs would be a nice snack. For a 55 gallon tank suggest a couple nice ciclids.