I say go for it but just be ready to "make neccessary adjustments" as you go along. You never know. I stock a jd, festae, freddy and midas in a 300 and it works....... for now. i had a green terror in the mix and it was a nightmare. Green terror tormented my festae nearly to death. Put the same Green terror in a 90 wirth a firemouth and a convict and the firemouth relentlessly chased both of the other fish. Reaquascaped about 5 times. Isolated fish for weeks on end before reintroduction. Nothing worked....
in the end i got rid of both the Gt and Firemouth. I just couldnt make it work no mattter how badly i wanted it to. With about 500 gallons at my disposal....
Cichlids are very unpredictable fish, and things can change very quickly as they attain size.