Banana daddy & banana hammock

I had to remove 2 plants because they hermied. It was either because I came in my grow room during dark, because I forgot my keys in there (dumb, I know) or because I pruned them and changed the water on the same day. To much stress for 2 of them. I think its the latter. I have one leaf that has begun discoloring, like you see on the photo. EC went from 1.0 to 0.6 in 5 days. I'm gonna change the water again this weekend and give 1.2 with extra cal