Talked to a woman from my church last night. She recently got a 10 gallon tank and stocked it with 5 platies. I almost told her the tank is too small, but I'm not sure.
She also doesn't know what sexes she has. I printed Tolley's picture for her, but I don't think she's aware of sex ratio requirements or the fact that she's probably going to have lots and lots of fry. I wish fish stores would give this kind of information but they're probably not paid enough to know it.
15 gal: 1 butt-ton Malaysian trumpet snails.
20 gal: 20+ various molly and platy fry.
55 gal: 40 neon tetras.
75 gal: 2 Taiwan reef cichlids, 3 pelmatochromis nigrofasciatus juveniles.