10 X Marimo Mossball 0.8~1cm - Live Aquarium Aquatic Plant for Fish Tank 10 x Marimo size 0.8~1cm high quality Your marimo friends will grow in tap water at room temperature as long as the water is changed every one or two weeks. The growth rate of Marimo is about 5 mm per year.they grow particularly large, up to 20-30 cm (8-12 inches). All they need is normal household lighting for them to make food, otherwise, indirect sunlight is fine. You should turn them over once in a while for them to keep their round shape. Marimo's are actually VERY easy to take care of, probably one of the easiest plants that live in water. you just have to change the water once a week and your done!" make sure NOT to have age killer in the water!!!!" { UNKNOWN FACTS ABOUT MARIMO} 1* They do not float unless the water is squeezed out of them. 2* They are NOT moss, they are a very unique type of ALGAE. Most importantly our Marimos are directly imported from Japan! Marimo, also known as Lake ball or Moss Balls. It is a rare growth form of the species where the algae grow into large green balls with a velvety appearance. Marimo is a very popular plant in Japan. The Japanese believe that Marimo will bring good luck and ever-lasting love to your friends or loved ones. It's easy to take care. Just give some water (can be tap water), ceiling light and love! Packaging excellent product protection .