I had the Same problem with carbon in my tank, it seems like every time I add it a few days later something bleaches out. Your not the only one ,So I just don't use it. By-weekly water changes for me.
Algae needs light and phosphate to grow, for a quick fix turn off your lights for 2 to 3 days, what I would also do if you have the RODI by then is on the second or third day I would mix up my sand bed right before my water change assuming your going to do more then a 10% water change. Or if...