I know you said you will just leave thing as is, but I just have a couple ?'s. Any pic's of your tank, fish, rock you have, how big are the Aulonocara "Peacocks" now, what are they specifically (red ruby's, nigarra's, german reds, rubescens ect. see
http://www.cichlid-forum.com/articles/african_cichlid_genus_gallery.php for a start to identify) some "peacock's" max @ 4" as big as 7". Any female's will for sure invite breeding, these are one one the easiest African's to breed & can spawn every 21 days. There is little to no true aggression in juvenile African's(aside from a weak fish, only the strongest survive) but as they get older they set up territories & aggression can become a real prob & expected aggression levels varies w/ the type of peacock(
http://www.cichlid-forum.com/profiles/category.php?cat=3). If it becomes a prob then you will have to increase the # fish, but w/ proper filtration & max aeration this is done all the time. 1 of my 55gl tanks is an Mnbuna/Trophous & I have 30 or so adult's at this time. It's loaded w/ (2"-3'') crushed coral as substrate, 110lbs or so of Holey Rock=9pcs. to divert attacker's, hide in & help keep my parameter's buffered. It has 2 Fluval 405 can filters(
http://www.drsfostersmith.com/Product/Prod_Display.cfm?pcatid=14633&N=2004+22777) 1 in tank Fluval 205, 2 hang on whisher 60's & 4 aquaclear 30's powrhds blowin full air on the underwater gravel filter's upstack's, creating about 1900gph of filtration, like a breaker/surf zone. These paticular cichlid's are among the most aggressive & they're jammin, however this is the tank that I learned that "packing " a tank can & will, done correctly, correct an aggression prob. Sorry, this is a BIG picture, long range scenario w/ no black & white answer at least has been the case w/ my 25 yrs. w/ these incredible (African Cichlid's) fish.
There is some debate over the color of substrate effecting the color potential of fish, it seems that a wide variety of proper feeding has more to do w/ it then anything. The crushed coral (
http://www.drsfostersmith.com/Product/Prod_Display.cfm?pcatid=7322&N=2004+113554) is used to buffer, to reach the proper pH & GH/KH thru the leaching of it's (crushed coral/Limestone Holey Rock) chem properties into the water thus helping/wrking for you to keep your pH & GH/KH parameter's in line w/ out the extensive continuous use of buffering chem's having to be purchased, dosed, mixed i.e. more wrk. The same is true about the use of Holey Rock/ Lime Stone (
http://stores.ebay.com/RockArtSource_Holey-Rock_W0QQcolZ4QQdirZ1QQfsubZ2497538QQftidZ2QQtZkm) this concept is used widely by long time purist African & Marine hobbyist. This all helps significantly w/ easily maintaining your parameter's w/ 10-15% water changes every 5-7 days & only clean 1/3 of your gravel/substrate at a time unless sickness require's more.
What type of filtration do you have i.e. gph being filtered, underwater gravel filter, powerhds, canister's, ect. If you have to increase your fish #'s (bioload) then filtration will all play an intricate part of doing so successful. It is always easier to do so when they're young if you wait & have to add more, make sure to completely change all your scenery, rock, cave's ect. so as to disrupt any exsisting territories which is at the root of aggression & you need to add at least 3 fish at a time, any less, the new addition will be the center of everyone's attention. Sometimes aggression can be eased w/ frequent 5-7x's a day feeding's which sound's like allot, but isn't as long as all food is gone in 1-2 min. full bellies kinda take the steam out of them, not so worried about gettin their's.
If you actually read all this & aren't cross eyed by now then I hope this hasn't been to overwhelming, once the basic's are understood then its all cake.
http://www.cichlid-forum.com/index.php is amazing along w/ most all it's link's, don't be affraid to make your purchases on-line, I'm sure you know this , but nearly
EVERYTHING is 1/3 the price then if you buy in your LFS,
no tax in most cases w/ minimal to no shipping cost, this includes fish(
http://www.davesfish.com/ located in TX
http://www.aquabid.com/ & w/ just a bit of research you should feel secure in doing so & happy that you saved a TON of money
, specially chem/water conditioner's BUY BULK. This is the way I have come to be able to have the most this hobby offers & more in the internet yrs. B4 dealing w/ LFS's just cost to much to really pursue the BEST CASE SCENARIO
More than just a bit more to consider
would love to hear more about your gorgeous tank & its bright color's, PIC's, PIC's, PIC's
I'd say if they aren't being aggressive to the point of injury, leave the peacocks as-is and don't add any females. That'd probably cause a riot among your males for her attention!!
