Join Date: Jan 2015
Location: Huntington Beach, CA
For walstad method, you need plants that feeds almost exclusively through their roots. Lighting isn't the problem.
Most stem plants wouldn't thrive in without water-column dosing. For ludwigia, you would see the plant growing very tall but lower leaves will rot and you end up with a large, tall stem with only leaves at the top. Sometimes even the stem rot.
Plants that will do well would be heavy root feeders like swords, crypts, vals, dwarf sags, bulb plants, and a few specific stem plants. Anubias will be fine.
Consider not having high light since walstad is meant to be steady, slow growing. Medium is suffice. Also weekly water changes 20-50% will replenish natural minerals in tap water, helps keeping leaves healthier.