I have one of my tanks setup as a paludarium and noticed that my guppies had given birth to babies. while watching to see if I could tell how many were in there, I noticed one of my Cobalts was watching as well and not only was he watching he was trying to catch them when they would swim by, I never did see him catch any but I was curious to see if he would actually eat it if he did manage to grab one and thought that his behavior was interesting to say the least, even though I know they are attracted to movement.