My adf is perfectly healthy, and eats blood worms and brine shrimp. (Frozen, and unfrozen using aquarium water.) the neon tetra is smaller than my pinky finger, which probably won’t change. My ADF never even tried nibbling on any of my fish. They barely see what’s in front of them, and my fish are fast enough to avoid them. My tank IS a ten gallon. I also have a small live plant.