You will definitely get clear water. I had a horrible green water problem where I could not even see 1 inch past my tank. I use the newer version of the sunsun which I believe is called Grech. 2 days later and I have ridiculous clear water without having to put any media.
I have a 30 gallon also. I plan to just pack some bio balls and the rest into filter floss along with a HOB. I am thinking about adding filter floss to get crystal clear water since I can easily replace the filter floss on a HOB.