PLATTY QUESTIONS! plz answer!?

Ok, 7 days ago I bought 3 red wag platties. They are in a tank with 1 male blue neon dwarf gourami, 3 rainbow plattys, shrimp and albino bristlenose plecos. UnfortAnatly, 2 of the red wag plattys (1 male and 1 of the females) are not doing so well and from my experience I am gunna say that they aren't going to make it. So at petco I saw a orange one that has olblack dots and kindof look like a orange cupcake with black and a few other colored sprinkles. I want those and some sort of yellow platty. So my question is, will the 1 female redwag platty be fine As the only only of her kind and with 3 yellow wag platty, the orange ones, and the blue rainbow plattys? Or do I have to get at least another female for her? Also will the female red wag platty mate with a male yellow wag platty? Or would any of thE platties I listed cross breed with eachother? Don't say it would bev overcrowded cuz im not worried about that! Will thE female red wag platty bE fine by herself and not another red wag platty? Is there any other plAtty that has a wag in it's name (example- red WAG platty)? And should I end the 2 sick red wag platties lifes peacefully before they infect all my other fish who are fine and not sick.?!