I just recently set up a 40 gallon breeder. Can you guys give me some stocking ideas for a 40 gallon breeder? Like for example bottom feeders and number of peacocks, And the more semiagressive and more pretty peacocks
"Peacocks" refer to species of the genus Aulonocara and the mass market hybrids which are not pure Aulonocara and may be more aggressive. All "Peacock" males are potentially very attractive, but there is no guarantee of perfect color. Males get colorful when getting mature. Intensity of color depends on pecking order and dominance.
People try to have male only tanks, and hope the males get along and hope that the males show at least some color. One male may become hyperdominant and be a bully. This is not as easy as a community fish tank, it is not as simple as just adding pretty fish together. You need to have it somewhat crowded, like more than 10 cichlids, to even out the social and anti-social interaction. You can have a small Pleco type. Personally, I think your tank is too small to have much of a male tank, so don't spend much money on good fish.
Or you can have a breeding group like James says, but then you would have only one colorful male, which you may not want.
Even with a breeding group it may not work. A few years ago I had a small breeding group of placidochromis electra in a 40 breeder, these are normally considered peaceful, the male decided would rather have the whole tank instead of females and killed them off one by one. I wouldn't try an all male tank in anything smaller than 4ft, even my 6ft all male tank is a handful 5 years in.
I would do 1m:4f of Aulonocara kandeense. I also tried a more aggressive (but still timid) peacock stuartgranti in a 36" tank and they didn't kill each other, but I didn't leave them in long and it was a very stressful tank...always teetering on the edge of "should I take them out or try it one more day"?
Another option is lethrinops...I had a breeding group in the 36" and they were perfectly happy.