Cladophora is a branching, green filamentous algae. Feels a bit rough and sometimes a bit gritty.
Cause Low CO2. Low nutrient levels.
Removal Can be very stubborn and difficult to eradicate. Make sure your dosing is good and keep your CO2 levels high. Manually pull out every bit you can see until it stops growing. May take a while but should work eventually. Make sure water circulation is good. Overdosing Flourish Excel may clear it. Amano shrimp sometimes eat it.