5 Red Mangroves
Very few true plants can survive in saltwater. The Red Mangrove is one of them. Red Mangroves can remove a large amount of Nitrate in your refugium, as well as chemical contaminants that come from your water or hands.
Because they do not "go sexual or respire" like macro algae, they present less risk to your systems ph balance, and have become popular recently with many aquarists. With proper trimming the plant can spend years in your refugium, larger plants will need an open top to grow out of. Many people are beginning to add the Red Mangrove to their display tank, as they want to mimic nature as closely as possible, while providing a habitat for their fish who will spend a large portion of time swimming in and out of the tree's roots. The Dwarf Planaxis Snail and the Cerith Snail love Mangroves, and will quickly burrow around the tree's root system. The three make an excellent combination in a refugium.
In this order you will be receiving 5 Red Mangrove Propagules. They are each roughly 5-8 inches tall. However, seeds can differ from those average sizes.
We have some articles on mangroves here: