Interesting, what zone do you live in? What comes to mind off the bat is "slug" but I have a feeling its something ells. Is it only the 1 leaf or is there more damage?
It's happening on more than one and on more than one plant. the tips (1 inch) of the leaves ago untouched. The plant that is the worst, is becoming a runt and lagging behind the other 3. I've never seen anything like it ?? Thanks for the get back GS.
I flushed with tap water & reintroduced regular nutrients at 1.2 EC, last night. Now it's a waiting game to see if she starts eating again. She wasn't eating her food. The other 3 are growing great. They've all had the same treatment !! Makes me wonder what I could have done differently ?