SO ive had a neon dwarf rainbow fish that hasnt been doing well for a while, she was very skinny, stopped growing taller, only got longer but never fattened up, would stay near the surface. All my other fish (other praecox, neon tetras, and swrodtails are all healthy and showing no signs of stress) I had lost one neon previously showing the same symptoms, and did not respond to any treatments i had tried. Anyways she died overnight and this morning all i could find was her head? Is it possible that my 10 neon tetras picked the carcass clean? I will continue searching for the rest of her, but i find it hard to believe anything else would separate the head from the body. Filtration is a fluval 306, pool filter sand substrate, some driftwood and a lot of plants.