Nope! I'm not saying that. I was just saying it doesn't normally grow in the filters, so that shoulda been left alone. Over-cleaning the tank wont make it go away, but could make it worse, which is why I said earlier to leave the filter be when you do a big clean. ^^;
Use Prime, it should help keep spikes in check and shouldn't feed the algae.
Less lighting will also work, you can try a black out. If you're uncomfortable with a long one, you can always do a shorter one and put a damper on the stuff at the very least, weaken it and it'll go away.
It WILL go away. It's just stubborn algae. You pick it off and keep the place clean, cut your lighting time in half for now at least, and it should clear up soon enough.
The biggest thing to watch out for aside from the lighting, is a dirty tank. If it gets overly dirty, oh so much nasty can sprout up from it and be hard to get rid of. The other is your stocking...How is it going on your bioload? It's not enough space for five angels once they hit adulthood along with other fish...but if your maintenance is really good and you do some extra water changes(I wouldn't know what to suggest really...a guess would be a 5% daily to go with your normal weekly, especially while you have this algae in there....don't over-clean by tampering with the filter and hold off until you see if that clean caused any spikes, if not then you should do that), keep things in check for the tank and the fish. This -should- lessen chances of algae problems.