The caulerpa is probably taking the nutrients. I would get rid of it, put your lights on 24/7 and the real magic, add some iron once a month. It seems Cheato need it to keep growing. I use a cap full of Flourish once a month. Many on here have had problems keeping it growing until they started supplementing iron.puck34696 said:I have both caulerpa and cheato in sump. They have been there for about 2 months. The caulerpa has more then doubled but the cheato hasnt grown at all. They are seperated and get about 12 hours of a 6500k bulb a day. Anyone have ideas?