Hi! i got 3 male guppies for my tank and since i put them in they have stayed allong the top of the tank acting like they are looking for food. I dont think it is the oxegen level as my tank has been running a long time and my neon and glowlight tetras are swimming fine along the bottom of the tank. Guppies top, tetras bottom. I was wondering if this is normal behavior for guppies and if they will eventaully swim all over the tank, not just along the surface. Kinda sucks b/c you cant see them unless you go lower than tank level and look up.