I have some zebra danios in my tank. I have had them for around a year now, and they are as happy as can be, dashing around like normal. However, one of them is really fat and getting protective around a certain corner of my tank, with another danio who I presume is the male since he is more colorful. They all are still healthy, dashing around and eating normally. If she is pregnant do I put them in a breeding net?