Hi, I've been tagging along with this thread for a while and want to say you have a beautiful tank. Just thought I'd throw my two cents in about determining the difference between male and female mollies. At two inches you should definitely be able to determine gender not by looking at the dorsal fin but at the anal fin. Females will have a full/normal anal fin and the males have a "stick", more or less, called a gonipodium. Hopefully this helps you with determining their genders. Cheers!
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