I have had a pair of snowflake clowns in my biocube for a couple of months now. They were in the same tank for several months at the dealer before I got them. They were both very good to each other never any fighting or anything. In the past week I noticed that ones belly has gotten larger and now that one seems to be picking on the smaller clown. How do I know if the clown is pregnant. What else would cause this fighting to just have started?