Attempt to avoid failure

The "firecracker" term is typical used to describe Tropheus moorii "Moliro"

All in all you do have 7 fish. Since the Duboisi still have the spots, I am going to take a guess that all 7 Tropheus are juvinile and less about 2.5" and are more likely in the 1-2" range.

These 7 fish will be ok in a 20 Long, with a Aqua Clear 110 powerfilter, and weekly waterchanges of 50%. But..you need to be planning on putting them into atleast a 55 gallon within 1-3 months.

Keeping Moliro's and Duboisi together is absolutley no problem in terms of interbreeding. When the fish start getting their adult coloration and start reaching a size of 3" or more, I would do everything possible to try and make the Duboisi total 8-10 fish, and the moliro's atleast 12 fish.

This will make your group size eventually be 20-22 fish, which will require atleast a 75 gallon in the future. I would plan to have a 75 gallon within 14 months.

If you choose not to expand this group, when the fish start getting to over 3" your going to have a problem with agression if the group contains more than one male for each of the two types. They will kill each other. You might get lucky, and have only 1 male in each, or get really bad luck and have all males. You will not be able to really sex them for certain till about 3.5"

I am not sure what your local fish store has for selction or price of the Tropheus you have now, but you can check out the retailers section and find a supply of Duboisi or Moliro rather quickly, and even with shipping will more likely beat a LFS store price, unless he was supplied by a local breeder.

Tropheus are expensive, but with online retailers, and breeders in forums like this that might have shipping availible, you can purchase them at a much reduced cost. So, dont be discouraged by pricing.

Check out your local paper or Craigslist and you could find a 75 gallon really cheap.

For filtration on the the tank, I would go with (2) Aqua Clear 110's and that would be your cheapest filtering choice. Clean one filter one month, then the next month clean the other one, and still perform your weekly waterchange.

Before you start all of this really, what was the issue for why your wanting to remove the Tropheus from the Peacocks 60 gallon?

If it is a diet concern, dont be concerned about that. There are some really good foods that both Peacocks and Tropheus can thrive on given proper acclimation for the Tropheus.

Is it agression, or something else?

Is the 60 gallon you’re keeping the same as a 55 SHOW?

I would keep a single variant of 12-14 fish of a moorii or duboisi type. Stay away from brichardi, annectens, and mpimbwe in a tank of this size. Groups of those fish need at least 25 in number to be safe, which would take a 125 gallon 6ft tank.

If your limited by a 4ft wall space, I would go with a 140 gallon 4ft x 2ft x 30in tall, or the 120 gallon 4ft x 2ft x 2ft, and these would work in a group size. BUT I still think it would be best to have 6ft tank for the more aggressive types.

Ratios Needed:
Duboisi - 1:1, but 1:2 is best
Moorii - 1:2 The lower amount of males will increase breeding, but harmony remains same
Kasabae - 1:2 same as moorii
Brichardi - 1:5 minimum, 1:7 is best
Annectens - same as brichardi* - *try to minimize the number of males period in this group.
Poli - same as brichardi

You have got to be careful anytime you mix more than one Tropheus type. Duboisi, I have seen are completely safe to mix with other Non-Duboisi Tropheus types. The others have some to A LOT of risk if you mix them to create hybrids.

I have kept the 3-Variants of Tropheus in my 180 gallon for 7 years now and not one Hybrid Fish has ever been generated.

If your going to keep (2) Variants together, you need to get a 6ft tank. I would not put (2) variants together in 4ft tanks, its just not safe to do so.

The safest mix is to get a Duboisi type, then pick any other NON-Duboisi type Tropheus you like to have.

Otherwise, get as far apart of location as possible (example: extreme north & extreme south), and as different of color as possible (example: all black vs high color)

Best of luck!

Geoff