Best light for max cheato growth

[MMM33732]

Live sand @ about 2.5" depth in display, 4" in fuge
Tank has been up for about a year and 1 month now.
I feed about the equivalent of 1.5 cubes of food a day. All food is completely gone within 4-5 min.
Tank is a 55g with 17g sump/fuge.
Yes there is a skimmer.
Fish is probably slightly overstocked, but feedings are on the low end for them.
Water change of 10% a week is preformed.
There is plenty of turbo snails in there as well as a lawnmower blenny. The blenny never touches the hair, only the film algae on glass surfaces.

 

[Triterium]

Heres an easy possible solution that might be worth a try.

Cut back to feeding every-other day. Your fish will be fine. Whether fish eat it or not, it is still adding orgainics to the tank.
Increase water changes to 5 gallons/day for at least a week.
When doing a water change, vacuum the substrate in the display tank. If it is really dirty, you may want to do sections at a time.

This is what i would do. You need to cut biological input, and increase output.

Overstocked tanks often have this problem. The solution is usually as easy as stepping up with the water changes, and making sure your filters are in working order.