If I look at the dorsal, it's a male. Are you sure that this ain't a balloon molly?
Could you make a better photo from the side to see if this one has got a gonopodium?
Yes, it's a male...View attachment 317727
A male, right? We got him in the shop as a small Dalmatian Molly and the others we have are all ordinary size without belly, they all turned black which I read is normal(?)