Your PH is low, it should be 8-8.4.
The thing is if you are having issues with algae then there is something going on in your water. Either you have higher numbers then you are seeing on your tests or you are overfeeding, or you have too large a bio load for your tank.
My suggestion is to do PWCs weekly, especially since you have a small tank. Make sure that if you have filter floss or sponges in your filtration that you clean them out weekly as well.