I found one of my black phantom tetras dead today (actually found a little tiny fish skeleton and by process of elimination deduced it was a tetra). They have been in the tank since March, perfect water parameters and no sign of disease or injury when I fed them yesterday. I always notice that when I feed frozen bloodworms, the tetras all swim around with one hanging out of their mouths (have seen a couple with 2 in their mouth). Is it possible for them to choke on one? I know their throats are very tiny so they definitely couldn't swallow one whole like the angels can. When I put a cube in water to thaw, there are so many to cut up but is it something I need to do to protect my fish?