And here we are again i did overcome the Rhizoclonium. My cube is up now for almost 4 month. I now have small amounts of green spot algea. I also have BBA and to top it of staghorn also start to grow. Can anyone help me? I think that my nano corner filter is to weak to create a good waterflow or do you guys think it should be good enough? I also have some dirt in my substrate but it's not on top bur sinked in it. How do I clean that? should I buy a vacuum for my substrate? and do I just stick in in then and move around? SETUP: Nano Cube 30L Dennerle CO2 (now around 50mg/l) 2 x Dennerle nano light 11w (8 hours) ADA Amazonia subtrate ADA Powersand Nano Filter Ferts: ADA Brighty K and ADA Step 1 changed from step 1 to step 2 after 3 months Water changes: twice a week 50% but stop it now for 1 week thought that that might help.