is it a saltwater tank? if so they'll be fine if your buying small plants. but if you intend on using the small plants in a freshwater tank then they would have to be started in a fresh water system. they cant be switched over to my knowledge. but if in saltwater theres no real requirements. they dont need powerful lighting, and unless the leaves are submerged, having co2 wont usually help. the leaves soak up co2 and the roots soak up oxygen...hope that helps
