I just had another batch of fry, my marble molly was in the 55 gal. While I was feeding them I noticed she had something pretruding from her poop hole. I didn't think she was having babies, due to she had a batch 10 days ago...So I thought oh Lord she has eaten til she is going to explode, cause she had no signs at all of labor. I got her and put her into a breeder trap, so I could watch her...2 min later she had 60+ fry. I have never had a molly to have any signs of labor, mine do not hide, do not looked stressed. The only way I have seen that I can tell is that there poop hole will pretrude.