Water hyacinth: large floating plant that has long roots for filtering the water. $2 each
Small 1" water lettuce. 6 for $2
Duckweed 1/4 cup portion. Tiny floating plants, excellent fish food. $3
Anacharis (Egeria): Free floating pond plant, can be grown in aquariums. limited supply. bunch of 5 strands for $3
Java Moss: Attaches to driftwood or sets on the bottom, good for spawning medium and baby fish protection. Can also be grown in a pond. 1/2 cup portion. $5
Jungle Val: roots in substrate and spreads by runners, can get 3' long.
$3 each
Sagittaria: In shallow ponds, emerges from the surface and makes white flowers. $3 each
Water wisteria: Greenhouse grown plants that have emerged from the water. When submerged in an aquarium, new leaves develop underwater that are finely divided. $3 for 3 stalks