Max,
To linebreed effectively you will need the following...
1. 3-5 15gallon tanks
2. power filters for the tanks instead of sponge filters. ( you want to increase bio-load and feeding)
3. 1 40gallon breeder or bigger for growout
4. 1 20-30gallon tank for breeding one pair only
Once you have the equipment you need to isolate the female with best color in 1 15g tank and feed heavy! Keep water quality prisitine!!!
Then pick a male with best color. Look around if you don't already possess a killer male. Only use the best you can find! Then place hime in another 15g right next to the females tank where they can see each other and fatten him up also!
After a month or if their colors go crazy,(breeding dress) place them in a 20-30g breeder tank with dark substrate and cover. You can use flower pots.
Once they breed get one of the 15g ready for fry. Use a sponge on the filter intake and go bare bottom. Start a culture of BBS and get some liquid fry foods. You can use a hard boiled egg and wrap the yellow yolk in a wet paper towel and squeeze the yellow water into the tank for a first fry food.
As you raise the fry pay attention to water quality and keep food density high.
Then once the fry begin to show color start separating to another 15g until they are ready to be grown out. I transfer to growout tanks after 1"
Then continue to isolate the best colored individuals for the next breeding phase. Also pay very good attention to finnage and body shape! Color is important but you want the total package!
Then just repeat year after year focusing on the best individuals!