So when I put Nix and Aquarius side by side in their cups like I normally do when cleaning their tanks Aquarius ignored her as he always does at first. However once he looked at her he flared a little then stopped and just watched her and Nix (who's body is normally slightly light because she is still a young girl, about 3 months old) turned BRIGHT BRIGHT purple. I mean her whole body turned purple. Normally when fish are stressed they go pale right? Well can they become brightly colored when stressed too? Her color was very beautiful and I have never seen her do that before where she actually darkened. What was that all about?