Are you planning on narrowing your stock down to males when they start to mature? My concern is that you're going to have a lot of aggression if you keep females... The venustus will grow too large for a 4' tank, as will the pictus.
I do plan on it yes. I will probably trade the venustus for some other male peacocks/haps when size becomes an issue. Right now I can say I think that 2 of the 3 lithobates are male, 1 male sunshine, 1 male msobo. Venustus can't tell yet.