my m8s got a blue lobster it defends itself but the fish are too fast for it but he also has a red crab and there always fighting so cant see his crab lasting long
my Cray get on with my red crab, and they will feed close together, but all critters have a personality.
cray slow

an example of cray speed. both my cray and my bala were in the same end of my tank, when i spooked them, the cray was in its cave before the balla arrived, at the same place!!!! and she had to park too.