I picked up four of these guys the other day for my 29g community. The tank also contains my breeding krib pair as well as six or so of their half-grown offspring.
The fish are about 2" long right now, so I'm not sure I can sex them. One seems to be the dominant fish in the group and has a stronger coloration on the edges of its fins, so I'm assuming this is the male while the other three are female.
I'm likely going to pick up more of these in a week or two to round out the school (and the tank in general). What sexes should I try to pick up? Should I aim for the typical 1:2 ratio for males to females, or do rainbow ratios work differently? I'm thinking I want a total of something like 7-8 fish.
These are my first ever rainbows and so far I'm quite liking them. They stay up near the upper areas of the tank for the most part and don't school really tightly but seem pretty relaxed. The kribs also pay zero attention to them, which is a good thing.
So, any advice on these guys would be appreciated.