I'm curious too, and am documenting the growth, etc., of my baby sevs I got from Jeff Rapps this summer. Got 5 F1 Orinocos (mouthbrooders) and 5 F1 Rotkeils. They were tiny-1" to 1/2"--when I got them in August. Now they range from over an inch to a scant 2 inches!!! The O's are already showing red lower flares; the R's go real dark. They all shift color alot, kinda sandy even tho' they're in a bare bottom. Can't even consider sexing them yet!!! I actually didn't get them to breed, I just love them, but I'll deff have a go at it, just to see what happens. I was give two young, one Turquoise, one Green, 3 and 4 inches when I got them this summer. I put them in the 20L alone and they immediately spawned twice, but the eggs turned white. I think the larger, turquoise is the female but not sure. Sure do love those boogers!!!!