Bad set up from the get go. Tank is too small, even at fishes current size. Oscar can grow an inch a month for almost a year. It's a South American cichlid that does best in warmer, acidic water. If you have a true Texas cichlid, H.Cyannoguttatus(sp)? It would like cooler more alkaline water. Tex, even a female can kill a bigger Oscar with ease. This setup won't work. No good for your enjoyment of the hobby, fish will suffer as well. You need another approach.