I am fairly new to the hobbey so any advice would be great. I have had my 29G tank for about 6 months and have just recently got an outbreak of green algae. I have recently added a new light which probably has something to do with it. It is mostly on the sand bed but some is starting to grow on the rocks also. I think it is from having to many nitrates in the sandbed. How do I get rid of this. Picking it off by hand is an endless battle. Thanks for any advice.