ive had a 10inch midas coexist with a 14inch birchir in a 100gfor 2 years until the midas died, i then added 3 more birchirs and a small flowerhorn, when the flowerhorn grew up he was fine. totaly ingnored the birchirs. i have had cichlids for awhile and 99 percent you should NOT put with birchirs. but there is exceptions, and if u raise a smaller one with larger brichirs in a big tank u should be ok as long as you take the rightsteeps <well fed, hiding spots, etc.> since then i have had to take the 100 down , now the flowerhorn lives with one birchir peacefuly in a 75. the other birchirs are in a species tank now