I'm no expert, but I will give you a few options to what it may be. If you could get a picture of this behavior it would really help. Angels are slower swimmers and in your tank with more active guppys and tetras, their behavior will be odd. My angles turn and angle themselves in all sorts of positions. Depending on the size of your angle your tank may not be large enough for the angles to swim around as much as they would in a larger tank.
My angles also seem like they are always hungry. We feed them a variety of foods to make sure they're getting enough, especially with other faster swimmers in the tank. It may be looking up for food.
I don't know a lot about fish diseases but hopefully this helps.
My angles also seem like they are always hungry. We feed them a variety of foods to make sure they're getting enough, especially with other faster swimmers in the tank. It may be looking up for food.
I don't know a lot about fish diseases but hopefully this helps.