Are there any live plants that are recommended for brackish tanks?
It’s a tough one, but most Vallis species will survive (especially giant), also java fern and moss are fine. The best plant is the onion plant. You will need to aclimatise the plants to the salt level slowly, and it would be best if they could be grown in a seperate freshwater tank first, that you bring up to the salinity of the main aquarium over several weeks (or better, set up the plants in the main tank first before adding salt and fish/crabs).