Leopardess said:
Well I'm not Roan so I dont know if you want my opinion

but I've kept those before.
Good lord, of course they want your opinion. You've got experience with these, I don't. Sheesh!
As for the pictures, Roan, are you thinking one is a female? They all look very much like boys to me. The females really don't look much like the males at all. They have an entirely different fin structure.
No idea. Never seen a female werneri. Even looked for one on the web and couldn't find one
Not that it really matters in this topic, but I don't think I would keep gertrudae in a 10g...despite their small stature. Rainbowfish need their room.
Eh? Yer kidding, right? They grow to 1", if you're lucky, 1½" max. They're thinner than neon tetras, too.
You wanna know what these guys do all day? They don't school at all. They chase the females. That's it. Oh, and eat. They preen and chase the girls ALL day. Man, even Boes don't do that ALL day. They're like pre-teen boys all hepped up on hormones. They use the entire water column. The dance starts at the top, then they move to the middle and they do their actual egg laying on java moss on the bottom of the tank.
Tanner is going to try to ship me mostly females, so the activity should tone down somewhat. Right now the poor girls never get a break until the lights go out.
I've got six in my 10g now and there's room for at least 4 more. Since I'm going to breed them, I'll be separating out the two oldest females and the best looking male I have, so that'll leave about 10 in there. Plenty of room.
Seriously, a 10g is fine for a school of 10 gertrudae. I would not put furcatus in a 10g though, they get 2".
Roan