You just keep rationalizing playing GOD by saying it is more humane for the fish I am sure that will save you from the fires of hell
Lets be honest, the whole reason so many variations of the same fish exist is due to humans "playing God". Merely breeding two fish together to allow a recessive trait to become a dominant one is "playing God" ex. Electric Blue Dempsey. Look at how many variations of goldfish there are, all created out of a single fish. Look at all domesticated animals people keep, everything has been selectively breed. What is a mule? Selective breeding is just as much playing with genetics as is what this guy is doing.
As long as this guy's is conducting this experiment humanely; not just while conductiong the experiment but also by not choosing to sell them to people who aren't going to treat them well, and he's not going to release them into the wild. Then I think he's doing something awesome, and nothing to become infuriated at.
We should all be interested in these kinds of things and support them.