I have found this to be true. I grow in a bark Based mix. I saw significant improvements with my plants when I started using some ammoniacal and urea based fertilizers here and there.
This is a regular bellatulum! Wow your eyes are sharp! Very round flower but regular markings. The leaves are very different from my other bellatulums. Wide and pale!
I was feeding more when using RO water . No clue. But just didn’t think it’s worth all the effort. Plants do quite well with little feed and water straight from the tap.