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What are the dimensions of your tank? What is your stock list? How long have they been in the tank and how did you cycle it?
 

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Too many/wrong fish for your tank size I think. In a 40" tank and choosing from your list I would do a species tank of the yellow labs because they are small and peaceful enough for a tank that is less than 48" long.

If you wanted 1m:4f each of peacocks, fryeri, labs and cobalts, I would keep them in a tank that is 48" long by 18" from front to back at minimum.

Malawi do not pair so if you are keeping more than one/species you want 1m:4f to manage aggression. Keeping them in this type of grouping will help the fish feel comfortable and be out and about more.

The water quality is not the concern with the size/length of the tank, it is aggression. Hiding is a sign, even if you don't witness behavior that looks aggressive. Your fish are afraid.
 

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The 40" length really limits you. Single species no matter what. And even then only a handful of Malawi will work. It would really make a better tank for Tanganyikans.

For Malawi mbuna I would do Chindongo saulosi and for peacocks I would do kandeense (I have tried 1m:4f of other peacocks without success) and for haps I would do 1m:4f Lethrinops. I would not do fryeri or cobalts, even as a single species, in a 40" tank.
 

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Demasoni are a difficult fish to keep, but it can be done in a 55G. However, because of the 48" length, so can dozens of other mbuna species like the ones you originally wanted to keep.
 

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In the 55G I would do 1m:4f each of these:
Labidochromis caeruleus yellow labs
Metriaclima callainos cobalt zebras
Cynotilapia zebroides Cobue

If you want to breed them you will need additional cycled tanks for the holding mothers and to raise the fry.
 
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