Biggie's Dead

Came home last night to see my alpha male dead. Still curious how it died as there were no visible signs of injury or disease. The only change i did was to create a big cave last weekend, and have seen this fella and no.2 jostling for the cave couple of times but each time he would emerge the winner. Looking at the carcass, it must have been dead for awhile. So happened that I didn't switch on the lights nor feed the fishes the night before as I was not feeling well. It could have been dead for 2 days.

Anyway immediately did a 50% water change and dose a little melafix in the water just in case. So far the rest of the fishes look okay.