You really should research before you buy, for all you know, either one of those species could have been suicidal maniacs!
The "red line"/"fire red" one, is it an Apistogramma agassizi? These are also harem species, like cacatuoides.
The "opal" one, is it an Apistogramma borellii? This is a pair species.
I consider members of opposite sex compulsory for SA dwarfs because they are a social group of fish. When kept individually, these species tend to have slightly "artificial" behaviour.
So, if I got the species right, then in terms for numbers, A. cacatuoides do best in groups of 1m 2-3 f, A. agassizi in 1m 2-3f, A. borellii in 1m 1f. The question you should be asking yourself is "is there enough space in my tank for the three males to split the territory?" (this depends on the exact layout of decor) and "can these species cross breed, if they can, what will I do with the fry?".