One is most likely bullying the other and thus eating the majority of the food, and causing the other a large amount of stress and malnourishment I would assume(?) although that is a pretty large disparity...I assume they were roughly the same size when you purchased them?
Have you noticed anything like that at feeding time or in general?
What are your feeding habits?
Tank size?
Water parameters?
Pics would really be helpful here. I'd like to see that smaller one.
actualy the white one was bigger when i bought them and i give them food and the black one lets it eat and seems to care for the white one and tank size 85 gal
