Thank you for responding to my last post. I understand that changing the resources on the planet when it changes type makes sense. After all, I've never seen Volatiles on a Water world, just like I've never seen Organics on a non-Habitable world (with the exception of pre-made worlds like Salamanca).
I decided to use the new Water world from my last post as a new source of food since it can do that now, but when I went to build the "Aquaculture" industry, if didn't find it. Instead, "Farming" is listed. While "Farming" and "Aquaculture" are mechanically the same (though building "Farming" is a lot cheaper than building "Aquaculture"), this is still a little strange. Is this a bug? Would it be possible to make it so, in the future, planets terraformed into Water worlds have "Aquaculture" as an industry instead of "Farming"?
Edit: Well, this is interesting. When I ordered that "Farming" be built on the Water world, I paid the 75000 credit price for "Farming" and that's what appeared in the build queue. But when it started to BUILD the industry, I checked it again and found that the industry had changed to "Aquaculture" on it's own. Furthermore, when I tried canceling the construction, it refunded me as if I had paid the full price of "Aquaculture", meaning it refunded me 100000 credits (40% of the 250000 cost to build Aquaculture). This means I made a 25000 credit profit. I think I found an exploitable bug.