Ok, I have 4 large Platies, 2 males, 2 females. The strange part is they tend to spend a very large amount of time on teh left side of the tank, going up and down, I think because of thier reflection. They eat like normal, and when I put my hand there they swim away, but then they just come back? Is this normal? Should I be worried? See my siggy for other inhabitants, and for tank size.