My earthmover is the largest. So this is not the problem, The 90 should be big enough to give some free space.. now I cheat I keep an african in my tank to calm my south americans. down... you will have to keep an eye on all of them and chasing will happen and gill flare will also.. but when you start seeing fin damage its going to the next level.. In my 150 i have the following
1 earthmover
1 jd
1tx
1 pink convict
1 salivini
1 jaquar
1 firemouth
1 orange midas (red devil?)
1 powder blue african
1 pike
1 earthmover
1 jd
1tx
1 pink convict
1 salivini
1 jaquar
1 firemouth
1 orange midas (red devil?)
1 powder blue african
1 pike