I've successfully bred Magic Fish #3. I have Environment Level 3, Food Level 2, Cleaning Snails, Temp Regulator, and the Aeration System. Problem: My crimson comets don't stay alive long past reaching age 20, adulthood. What can I do to get their health to stay up without buying tons of medicines?

You shouldn't be having problems with the health of any species of fish at Level 3 of Fish Environment, which allows you to breed even the most fragile hybrids. As long as you're not overfeeding them, and you cure them when they're sick, they should stay healthy.

Is it only that one fish that's dying, or are there others?

Crimson pigmies are as well, actually. They just slowly die. I don't get it. *scratches head*

Double check your researches, make sure they all say "this has been fully researched". Then check their food and health bars off and on, make sure you're not feeding them when their food bar isn't at least 1/4 empty.

I only seem to be able to successfully breed the Fertility fish. Can you tell me if only the magic fish sell for high prices?

I think the food level should be at 3 also which prevents the magic fish from being sick.

I have level 3 food and level 3 environment and mine aren't dying like that. That is weird.

When I had lvl 1 food and lvl 3 research even my fire-arrows are completely healthy!

Well I have lvl 3 in food and lvl 3 in research and everything I have breed since then have been perfectly healthy! I suggest you call custumer support and ask them about the problem and they will tell you the exact answer! Good luck

that's for sure!