I know in my tank, my Water Wisteria looks more like sword spike wisteria. They are constantly ripping off pieces and munching away. Luckily, it grows fast and it's now providing veggies for my Discus. The other one that I love is Duckweed. Yes, the plague plant duckweed. It adds a bit of darkness to the tank and guess what - they like to eat it! I usually catch one every once in a while taking one out for a snack.

So, what other plants seem to be veggies for your Discus?