07-03-2013, 10:11 PM
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Usually it's black mollies or darker ones that get in gold flecks sometimes. I haven't seen it happen with white ones, but I'm sure it can. Sometimes mollies DO get in different colors, markings or get darker with age. It's possible she wasn't well cared for before you got her as well, this can cause their colors to become fairly dull. I had one that came in mostly white with a gold tail, two months later he ended up being a dark steely grey with a gold belly and tail and dorsal fin. =)
It IS stressful to them if they're bickering a lot. This is actually quite common if there is not enough room(mollies need a minimum of twenty gallons), not enough mollies to school with(mollies should always be kept in groups of 4-5+), and on occasion when pregnant they get reaaallly nippy with others in the area. Some worse than others, and some don't get that way.
It's also possible it's damaged scales. Add in some Stress Coat+ and make sure everything in the tank is as it should be. Stress Coat will help repair damage shoudl there be any, and lessen stress. Water parameters being off can also cause aggression. A small spike in ammonia or nitrites can do it. So make sure that's all at zero and that the water is nice and hard, mollies like hard water. They also like it warm, around 80 degrees. If things are too far off, they can get uncomfortable and be very grumpy about it. You can also add in some aquarium salt. They like brackish water, which aquarium salt doesn't really do but it helps, but it also will help up immune systems a bit. They may just be stressed out or not have the room and group they desire. On occasion though, you also get bullies. Best thing to do with a bully is find a tank with new mates that can handle themselves, divide the current one, or find it a new home. I've had females come as bullies and they will kill. =/