his tank size and stocking are a couple of posts up
Call me blind, I completly missed that.
I'm a little concerned That you are showing nitrite Rodger. How long have you had the tank set up. You should be changing around 30 gallons a week which is a little over 30%, right now you are doing about 7%, which really isn't going to do much.
As for stocking, you have:
Peacocks/Haps
A.beanchi x3 - (baenschi) 5", carnivore, fairly peaceful, peacock
A.Sulphurhead x3 - Protomelas spilonotus, 10", carnivore, peaceful, hap, too large for your tank
Red Kadango x3 - Copadichromis borleyi (Kadango), 8", carnivore, peaceful, hap
S.Ahli Electric Blue x 3 - Most likely Sciaenochromis fryeri, 7", carnivore, mildly aggressive, hap
Mbuna
C.afra Red Dorsal x3 - herbivore, 3", aggressive
L.Hongi x3 - herbivore, 6", aggressive
P.Acei x3 - herbivore, 7", mildly aggressive
P.Elongatus red x3 - herbivore, 5", highly aggressive
P.crabro x3 - herbivore, 8", aggressive
P.boadzulux 3 - couldn't find any reference, even tried google, could you post a pic?
M.Lambarda x2 - I'm assuming you mean metriaclima lombardoi (kenyi) - herbivore, 6", highly aggressive
Well, first off, I'd say you are massively overstocked, which would explain the nitrite showing. I'd suggest deciding if you want to keep mbuna or haps/peacocks, while the two can be mixed, it's a little difficult. Hap/Peacocks are carnivores, while mbuna are primarily herbivores and can develop bloat if fed too many meaty foods, you can get around this by feeding a pellet for herbivores and supplimenting with spirulina enhanced brine shrimp. There's also a problem with aggression, while small, mbuna can and will easily dominate the tank, and you may lose some haps or peacocks, but at adult sizes the tables are often turned on the mbuna and they can end up snacks, or being bullied.