[trenac]

I would resort to chemicals only as a last resort. Try natural methods first, such as the blackout. Most people have great succes with this method, so it's worth a try.

 

[trenac]

a blackout won't do any damage to my plants and fish will it? And should I feed my fish during this time? would dosing with Excel help or does that only help certain types of algae?

No damage should be done to your plants or fish. This link will tell you how to do the blackout day by day... http://www.aquariaplants.com/cloudygreenwater.htm

Excel will not help green water.