Are pregnant fish very nervous? About 2 weeks ago my pregnant platy started getting really nervous; she'll dart around the tank at feeding seemly afraid of something (I don't think it's me as she would always come to the front when I came to feed her. Today she even ran away from a flake after she bit the flake and part of it brushed her belly. She also spends the morning in the back of her house with her head facing the darkness and only her tail visible.