Wow, amazingly great feedback, way more than I was expecting. I'll re-read the responses above again, contemplate them and commit the concepts to mind. Thank you three for this.
The seedling is
Tah Tsai (Brassica rapa subsp. narinosa 'Tatsoi') growing in my aquaponics bed.
The middle photo with the pink grass is
Ruby Grass (Melinis nerviglumis 'Savannah')
The last photo is
Love-Lies-Bleeding (Amaranthus 'Opopeo') (which actually has no photos in the database. I need to correct that.)
Thanks again all. Next time I shoot some for critique I'll start a new thread.
