I just bought 3 from my lfs they are an inch, how fast do they grow and I assume they get 6" full grown (that's what lfs emplyee says)?
Firemouths are not peacful in the sense that they are very territorial. Ive always kept them for years and one thing that i find constant they will pick a spot and territory and defend it and harass any fish who come near. In a large enough tank day 40+ with semi aggressive fish or cichlids this is not a problem because there will be enough space for their territory to not be crowded. Tank mates are best kept with similar sized in mind but my monster adults are holding their own against fish like oscars, texas, viejas ect. Ive seen them do well with geophagus as well.
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They are among the most peaceful CA cichlids, will take years to get "large". Good tankmates for other peaceful CA cichlids like rainbows, and for the laidback SA like acaras, festivum, severum, chocolate