So we recently got two gold zebra loaches, and I noticed one of them had a large belly. After doing some research I came to the conclusion that it might be because it was a female. However, this morning, I woke up to find her as thin as the other one! Could she have been pregnant and layed eggs? She was fat when we put her in the tank, and she is also quite active and healthy. I tried looking at other posts, but none were the same answers. There are four harlequin rasboras and one albino pleco in the tank as well, but I don't think they had anything to do with this. I'm a beginner, so I don't really know too much about have fish. Hopefully someone can help!