Need Help!! Aggression problems, Need advice from experienced African keepers

Was just at a buddies house last night and he swears by purigen.  It for his reef, not FW, but works for both.

I would also say to pick a Lake.  I think w/the stock list, you could move the first 6 fish.  Then, the last seven on the list minus the BN.

I also had a bad problem with high nitrates in my 55g. Then i used seachem's purigen and that really did the trick. My nitrates are barely detectable now.

If your looking at dems I would go with

12 -15 dems
6-7 yellow labs
5-6 rusties
5 acei

Use's the whole tank and gives you a lot of color.

if you go with mbuna and are keeping the demasoni stay away from other fish that are similar to the demasoni.

A "cookie cutter" that the forum likes to recommend are Demasoni, Yellow labs, and Albino socolofi. that gives you blue/black, Yellow / white. and you need a lot of Demasoni because the are aggressive towards themselves. I usually kept 15-18 demasoni in a 55 with 10-12 Yellow labs with a lot of filtration.

I am pretty sure you could get away with:
your 5 labs
12+ demasoni...

Then you could probably get more labs or get something else...as to what else you could add I haven't done enough mixing and matching mbuna.  I will say this, it needs to be either a different color than the other two fish OR a different shape OR occupy a different part of the tank.

Here is a good link to some cookie cutter set ups. 
cichlid-forum.com/articles/cookie_cutter_75g.php

When I start mixing species I find that this is usually a good place to start.   

Well lets say that I would remove my larger more aggressive mbuna and the tilapia butterkoferi.  What species of mbuna would be good for my tank?  That would not get too big, be too aggressive, and I could find fairly readily.  I have 5 yellow labs, and demasoni seem like an option but they seem like they can be a bit aggressive too even though they stay smaller.  How about Metriaclima callainos or red zebras?  Any other suggestions?

Also I do not have any ammonia or nitirite probelms, I clean the gravel and filters weekly and am over filtering, the nitrates and aggression I think are my only problems.

As usual, great advice from Kegger and Aaron (whetfish). I can't really add something until you decidethe direction you want to take. But I will say that eventually that Butterkofferi is going to demolish EVERYTHING in that tank. None will survive him. They are truly relentless bruisers in every sense of the word.

Would a Peacock/Hap tank with a lower stocking level work in a 75 gallon.  I have read online of people doing this and still having aggressive fish problems.  Or if I did like 6 Psuedo Demasoni and 6 Yellow labs, and 6 other mbuna, would this work?  Because I have read of people having an all demasoni tank and having them all get killed by one dominant male over time.  Is it better to have all different looking fish, or many of the same to spread out aggression?

I have an only demasoni group.  16 dems in a 75g.  Lots of rock work.  Three or four females are holding.  It's about a 50/50 male to female ratio.  Is there aggression?  Yes, only one or two have fins that are pristine.  Nobody has been killed and they've been in the set up for about two months.

6 dems probably isn't enough disperse their aggerssion.

well, I think 1st of all you have to figure out what type of tank you really want to have
Peacock, Hap, mbuna, Tang
I have to admit that when I first read your post I really didn't know what to say since your tankmates together would be better than my blender at tearing something up

saying that if you want a peacock/hap tank is your first start but remember that with any african tank you will get aggresion and if you add any females to the tank you can at least quadruple the amount you will have
I guess what I'm saying is figure out what type of tank you really want, do some research on each fish that you want to stock it with, get that all figured out and then take the hit in the pocketbook by trying to sell off what you have to try to recoup some of the loss and then start anew but keep the numbers down from what you have, also your nitrate problem will not go away with just using stress coat, what would be good for us to hear and comment on is HOW you do your water changes, are you just taking water out and adding or are you actually cleaning the substrate because if you're just changing water without getting any of the waste off the bottom your amonia problem will continue

Would a Peacock/Hap tank with a lower stocking level work in a 75 gallon.  I have read online of people doing this and still having aggressive fish problems.  Or if I did like 6 Psuedo Demasoni and 6 Yellow labs, and 6 other mbuna, would this work?  Because I have read of people having an all demasoni tank and having them all get killed by one dominant male over time.  Is it better to have all different looking fish, or many of the same to spread out aggression?