hard to say...most flowerhorns will kill any tankmates..i've owned about 5 FH in my lifetime and all were in tanks by themselves...if i ever get another 6' tank, i'll try and have a FH community..i think it could work if all were introduced at the same time and were all around the same sizes...i've owned 2 asian arowanas and both lived with numerous tankmates....most aros only seem to not get along with another aro in the tank...