I agree with PC
.. Increase your water changes to 10%-20% weekly .Loose the bio wheel they are nitrAte factories ... Place in a new filter cartrige these should be changed at minimum monthly and washed/rinsed weekly . Cut back on your feedings and reduce photo period ... Then also you can run a phosphate sponge to help you along , when preforming your water change you can siphion off the algea . Tho even with weekly changes and maintainence you will still have some algea but it wont be bad , we get it on the glass and on the filter but it really doesnt get a chance to get a foot hold else where in the tank ..
Also in another post you are saying you have a "new" tank , a new tank will have alot of extra nutrients that it cant keep up with right away so that could also be a part of your problem just stick with h20 changes and abreviated light schedul , loose the bio wheel , and change out your sponge , and add a phosphate sponge if you would like but give it time for the biological filter to catch up