Just returning the hello! How's the set up's going?
Your FM will be fine with the O's as long as the tank is large enough and you provide her with plenty of hiding spots as they can be quite timid and you don't want her stressing out. Also, if the O's are larger, i would add her to the tank first. Once larger O's have settled into a tank, that is their territory and they won't like any intruders (my Red O likes to have a go at my hand when I'm doing maintenance).
Years ago (and i mean years, i was seventeen, I've just turned thirty
)I had a 270ltr tank, I'm not sure what that is in U.S gallons, with one O and five firemouths. I started them all off from young, the O was about 2 inches the FM's an inch.
They got on fine for a year or so, All fish grew fast and healthy until...and here's the sad bit...The idiot of a bloke in the aquarium shop convinced me that his lovely looking Jack Dempsey, a fish that at the time i had never seen before, would go fine with my other fish. by the next morning a 5 inch JD had killed my 7 inch O and terrorized the FM's to the point that they wouldn't come out from hiding for a couple days after. I was gutted, and not all too friendly when i returned the JD.
O's tend to do well when brought up from young with other less aggressive Cichlids, although as said you get your rogues and you get your laid back fish. Allot of it with cichlids is trial end error to be honest.I'm still learning, and still haven't tried everything. One thing i have learned with Cichlids in general is that if you can help it try not to force them to live in a certain way that is against their nature by adding the wrong or overbearing tank mates, and give them the cover they would desire in the wild. I hope that's of a bit of help. Sorry if i went on a bit much.
