I had level one environment when a few of my fish were born...Greenfin Arrowfish, Flagged Fruitfish, and Golden Leaffish. They were completely healthy and I was just breeding them over and over so I would continue to have the same 6 breeds until I built up some cash. After a few generations, I got up to Environment 2, and their health dropped. Shouldn't I still be able to raise them in a BETTER environment? I'm confused.