Oh wow, I think I’ll get 2 then. I’ve been looking around and I heard they can propagate fairly easily too so 4 might be unecessary.My big one takes up about 1/4 of the scape when it's fully opened, front to back and side to side (it's a 20g long) if that helps you visualize the number you may need to achieve the look you're going for.
Yes, probably. I have been using a liquid fertilizer but no root tabs, it is planted in an aquasoil type substrate, so I did not think I would need them yet, but maybe its time to try some root tabs.I used some root tabs along with a liquid fertilizer. Maybe it liked the abundance of minerals in my water.