Did not see the dovii, that throws quite a wrench in the mix. There is some debate on tank size for a dovii, but most agree that a fully grown male would need a bigger tank than a 180 gallon. And if you were to keep it in the 180 gallon, chances that it would allow anything else after a while are very, very slim. Then, you have an Oscar, carpintis, and green terror, all of which get too large to live in a 55 gallon tank. The reasoning being, that the 55 is only 12" wide, and the Oscar can exceed that size, carpintis and GT can (hypothetically) grow to 12". Some would say the GT or carpintis alone in a 55 is ok for lie; this is not my opinion, but is debatable.
My recommendation would be to sell the dovii, then keep the Oscar GT and carpintis in the 180. You may have some trouble with the carpintis being more aggressive than the SA cichlids when large; or it may be fine. Then your convict can stay in a 55 with some other fish.
BTW, not trying to be negative or rain on your parade here, just offering my insight on the situation. Wish you the best of luck with the fish.