So this has just happened to me, i jus walked past my tank and my 1 n only bala shark got spooked and has just absolutely smashed its head on something so hard that it is literally it i think its about to die. Its right eye has poped out and its turnt more and more red over the last few minutes. It was swimming about a bit aimlessly a minute ago and on the odd occasion just started going crazy. Its a shame because we have had him for bloody yearss and he is huge! But, unfortunatley it does look like he is dieing and his road has come to an end.