So, is this fish a Molly or a Platy?

Well, one of the most obvious ways to tell is that platies have shorter top fins than mollies. Also, from observation, the mollies faces are more slender than those of platies. The pictures shows both qualities of a molly.
 
It's a sailfin molly. They get quite a bit bigger than many other mollies like black mollies.
 
i was thinking either sailfin gold molly or creamsicle, but my experience creamsicle have a lyre tail , which i am not seeing, 24 kt gold molly is what i have seen it as



on a side note : Tucson Petsmart convo while I was looking at the different angelfish for my future 55 gal purchase. Employee: With your tank size I would recommend two to three mollies, couple pink kissing gouramis, 5-8 neon tetras (for schooling effect), and a common pleco or two for algae control. Me to fellow customer (mostly my muttering): Wow that must be a big tank! Customer Response: Just a ten gallon kit they sell here ( ten gallon with whisper 10).

Gee I was considering pink kissing gouramis for the planned 55 gal but when I saw 18-20" even I recoiled. But yet he bought all those fishes, poor guys, and I thought I was overstocked with a dalmation lyre-tail molly, black molly, mickey mouse platy, black tail platy, two dwarf powder blue gouramis in my ten gallon but with dual whisper 10's
 
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every molly is a sailfin unless it is a sphenops. The dorsal fin varies in size depending on the individual, how much of each variety is in the parentage, how old it is, the water conditions, and size of the tank it was raised in. There are black sphenops and black sail fin. The mollies sold at pet stores are all combinations of sphenops, V, and L. The ones usually sold as "sailfin" with the big fins just have more L parentage. There are only three sub species of mollies, everything else is just a name for a coloration. And any of them, S, V, or L can be any combination of black, red, orange, gold, yellow, white, silver, black, and others. People keep posting about mollies who have no idea what they are talking about. :-) There is also a sailfin platy.
 
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Definately a molly. In fact I have one that looks very similar. As a general rule of thumb, don't buy fish from people who don't know what they're talking about. It could cost you more in the long run!
 
Nice male molly.

Is he in with females? Babies come soon...

FYI, I have seen black, white, silver(ish), blue, and several shades of yellow/orange in mollies. Some are calico...almost like a calico cat.

Here's a few pix...the big female lost her anal fin and part of her tail, but that doesn't keep her from bullying the others at feeding time!
The male is the 2nd pic is long gone, unfortunately.

DSCF1654.jpg DSCF1668.JPG
 
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