Problem apparently similar to Wistearya's in this section. What's with these sudden deaths?
My new Petco/king of which I was so proud was adjusting nicely to his new home. After a week of decreasing skittishness, he was eating enthusiastically, evacuating copiously, responding appropriately and gaining weight.
I put him to bed Thursday night well-fed and healthy. Friday morning, he looked a little slow and pale, showing less than his usual volume of feces. I checked the water and decided not to feed him that day.
At 4pm he was very pale, breathing hard and running into the walls, but swimming upright when not resting on his filter or in his plants. I immediately did a 50% change and began a "Help" post to this forum.
At 6pm he looked and behaved even worse. I began to prepare an epsom salt bath. By the time I was ready to put him in, he was dead.
He was in a 5gal unfiltered tank with live plants at 79* eating 9 Omega One pellets per day in 3 feedings. I performed at least a 50% change almost daily (he put out ammonia like a goldfish) so he never saw >.25 NH3 nor any NO2.
I'm still in shock. I've never heard of bloat killing an apparently healthy fish so quickly. I've dealt with something that looked like this before, always to a positive outcome. What is possibly going on?