I have to agree with Eamericanus, less is better.
My WAL is 4 years old and just under 30" and is fed Massivore pellets, algae wafers and Talapia strips.
I feed mine in fits and starts, 3 days on, 4 days off, 2 days on, 1 day off...ETC. I used to feed on specific days of the week, even placing its food in a ceramic dish in the tank. I found with this regimen it became lethargic and just waited for food.
With the fits and starts method, I see a lot more activity, gravel digging and foraging type behavior, which I believe is better for the fish and certainly more fun for me!