I just began a breeding project today with ramshorns coincidentally. I'm going to breed them as dark as I can. heh Maybe we'll have some black ramshorns soon.
Anyway, years ago I found that a tenner worked great. Today I have an extra 4g acrylic so I'm using that.
Spinach is miracle food for propagation and growth for these guys, and I'm using gh/kh SS with a gh of ~12