The ammoniafill places ammoniacal solution, so I'm curious why the crafting recipe takes ammonia and not the solution directly from the ocean. Your other mods, oilfill and lavafill, take heavy oil and lava respectively directly from the nearby oceans, so why does this one not do that and instead require 1 step of processing?

I would suggest that ammoninafill takes the ammoniacal solution directly from Aquilo's ocean instead off requiring processing int ammonia first, but this is your mod so you do what you're going to do.

You appear to be correct in that I put the wrong one as the requirement. Unintended oversight during the making. First time doing any kind of Factorio or .lua modding, it's all a learning experience lol.

This is now fixed and correctly requiring "ammoniacal-solution"

No worries, thanks for taking care of that!