I have the pink ones they are hardy and have had the main stalk in my tank for six years. They drop babies like mad but are beautiful. I have filled a biocube tank with just droppings and am currently starting a fourty gallon with another colony. Pick out the dropped babies as soon as they drop, don't let them attach. If they do attach where you don't want them then cut them as close to the base and cover with super glue.