How do you change the fog color when in liquid

I had the same problem...

I tried doing an overlay whenever you were in the fluid but it make the texture super small and it didn't work

If you edit the code, there's a thing for the underwater fog color (it's separate from the water color itself). However, to change it you need to lock the code, which kind of sucks because then if you want to make any other changes, you have to do it with the code (though a lot of them are easy to change, many things are just "true" or "false").

What is the code for it though?