I have a 12 gallon Nano cube I have had set up for 3 years, I do a gallon water change weekly, when I slack and skip my water change I always end up with the same algae (cyno) but after I catch back up it goes away. I also added a spliter to my inlet and a piece of locline length and put in a bigger power head in the back. Make sure that your water filters are good so that you are not adding Phosphates in there, you can also put some calerpa in the tank. It won't work in the back unless you can put a light on it, which I have heard of people modify.