Ok here it is. I have a 20gal tank with three angels. I know they get too big for a 20gal, could I get away with putting them in a 55gal with a yellow lab,albino zebra,lab fulleborni,dim comp, and a rusty? Im thinkning about removing the dim comp.
I would advise against it. The long finned, relatively slow moving and peaceful angels would not stand a chance - and even if they don't get torn apart they'll never be fully comfortable.
The dimidochromis Compressiceps is a foot long predator that will not only outgrow the tank, but it will eventually happily consume your current mbuna. Removing him would be a very wise decision.