* Watercress (Nasturtium officinale): Watercress is a leafy green that can be grown in both soil and water. It's a good source of vitamins A, C, and K, as well as iron and potassium.
* Anacharis (Elodea canadensis): Anacharis is a submersed plant that can grow in a variety of water conditions. It's a good source of oxygen and helps to keep the water clean.
* Hornwort (Ceratophyllum demersum): Hornwort is another submersed plant that's a good source of oxygen and helps to keep the water clean.
* Java moss (Vesicularia dubyana): Java moss is a non-flowering plant that can be attached to rocks or driftwood in the aquarium. It's a good source of hiding places for goldfish and helps to keep the water clean.