Is my African cichlid aquarium too over stocked?

[Fishkeepingaddict]

I have a 55 gallon aquarium and have 4 yellow labs, 4 Pseudotrophesus, 4 bumble bee cichlids, 4 red zebras, and 5 Dwarf Petricola. All my African cichlids are kept in a 1:3 male to female ratio. I heard that African cichlid aquariums should be a bit overstocked to spread out aggression. I was going to buy some colbat blue zebras but then the worker at my lfs told me I had too many fish even for a african cichlid tank. Is this true?

 

[Rbishop]

I'd hold for awhile. What size are they and approximate age? Can you show us a pic so we can gauge the decor for them?