I used Gardner's Tree Crab Food because it has mangrove sap in it, but after all the recent research on food additives and pet food horror stories, I'm getting rid of it, because it has meat and bone meal -- I'm going to write to Mr. Gardner and see if I can persuade him to switch to purer food sources, but in the meantime, I have no mangrove for my crabs. I believe that mangrove is a good basis for crab diet, as it is ubiquitous in all tropical locations and crab habitats. It contains tannin for one thing, which is color enhancing, and according to Mr. Gardner it enhances good cuticle production. I have found a source on line for live mangrove seedlings. These are intended for the aquarium/terrarium industry and can grow in the water basins, collecting nutrients while it helps to filter the water. http://www.floridaplants.com/Mangroves/Default.htm <span class="ev_code_PURPLE">The Red Mangrove utilizes an internal salt pump to exclude salt ions. This is the means by which the plant survives the saline environment. The "pump" is a cellular process whereby the element magnesium (Mg) is taken into the plant's cells, forcing out sodium (Na) ions. Therefore, growing Red Mangrove in a closed system such as an aquarium requires close monitoring of the magnesium balance as the plants will remove not only the nitrogen wastes in the water, but magnesium as well. When magnesium is depleted in a tank, the plants will turn yellow or exhibit other signs of salt stress, including shrivelling. We specialize in Red American Mangrove in tree cones and gallon containers for coastal planting. Our aquarium-size plants are grown hydroponically and shipped with 4-6 leaves. Our plants are grown from seed collected in Florida East Coast waters. Contract growing, contract planting, monitoring, and arborist service is also available. Red Mangrove is a tropical plant and is damaged at sustained temperatures below 45 degrees F. We cannot ship where plants will be exposed to these temperatures for prolonged periods before delivery, so order before winter sets in! SHIPPING INFORMATION We are certified for shipment to California and Texas. Shipment outside the U.S. requires purchase of a phytosanitary certificate ($40.80). We obtain the Certificate and required inspection for you, but the buyer must pay the cost of the certificate and whatever fees may be required for walking plants through Customs. WARM WEATHER SHIPPING REGULAR GROUND SHIPPING. Now included with purchase. For those who wish to order less than 5 plants, the minimum is set to 2. </span> I can hardly wait until my little trees arrive!