Well i owned a 55g 3 years ago the first tank i ever had,my stock was a jag,2 ebjd,green terror & fastae...The jag out grew everyone,she was so agressive towards the other tank mates i had to give her to a freind of mine.I Upgraded to a 75g.The green terror a couple of months down the road picked up where the jag left off,gave him to a co worker,by the way he's a beutiful fish but still agressive lives in a 55g alone,has no toleration for tank mates...My ebjd,one i gave to my sister the other i kept in the 75g with the fastae.Guest what the fastae was beating the crap out of him,so i put him in a 30g,a week after being there he comitted suicide........You can put them together they might live peaceful side by side for know,but remember not all fish are compatible with each other,some fish are more agressive then other,so .....good luck..