It doesn't look bad, but without a bigger picture of your tank it's hard to tell for sure. 2 times a day for feeding isn't bad either, depending on what you have in there (including cleanup crew). What's your total stock list? I've been feeding in my 12 gallon 2 times a day for over 6 months and haven't had any issues with problem algea (have 2 clowns, 3 astrea snails, 5 nassarius snails, 1 margarita snail, and a cleaner shrimp). My lighting in that is also only 36 watts. I keep that one for about 10-11 hours max. What wattage are you using on yours? Also, is this something that you see happening all over your tank?
Investing in a phosphate testing kit may be a good idea, if you don't have a LFS that will test for you. I have one that will test for anything, any number of times a week, etc. I test for the standard stuff but for things like that I'll take it in there. Mix up a batch of saltwater and take a sample to test for phosphates before putting the water in your tank. If you take a sample directly from the tank you won't get good results because anything in there that consumes phosphates (the algea) will skew your testing.