Not quite 1200 gallons but in my 8x4x4 I have an Argentea, synspilus, crenicichla cincta, a trimac, 3 wild caught oscars, 3 cichla kelberi, 3 pimelodus ornatus, cichlasoma ornatum, and a group of 3-4 different species of silver dollars (green sd's, green red hooks, a couple that are like dolphin pacu, and 3 unidentified from argentina). They are all pretty young fish and are all under 8". I may need to separate some later on, but all is well so far. Oh yeah, I forgot a single small male Lepomis megalotis.