I think I found the manual for the strips you're using:
http://www.apifishcare.com/pdf/Testing_Chart_1_16_14-1.pdf
According to this chart, a reading of 80 for Kh is roughly equivalent to 4.5 dKh (degrees carbonate hardness), which is very far outside the range of normal for reefs. I would think it would be difficult to have a pH anywhere near 8.0 with carbonate levels so low, but it's possible. I'd be willing to wager that the test strips are way off. It's difficult to read these types of values accurately with test strips.
I'd recommend picking up some Salifert test kits from Amazon or Bulk Reef Supply. BRS has free shipping on everything, and of course Amazon has free 2 day if you have Prime. Each kit is only about $15 and they last a few months depending on how frequently you test. I would at the very least buy a test kit for Alkalinity (carbonate), calcium and magnesium. I'd also pick up a refractometer (if you don't already have one) for salinity. Swing arm hydrometers are not very accurate.
There are lots of parameters one can test in a reef tank, but in my opinion, those are the most important. Salinity is important for obvious reasons, as sodium chloride is one of the most abundant compounds in seawater. Alkalinity (more accurately, carbonate) is important because stable alkalinity helps maintain a steady and high pH. Additionally, many corals are sensitive to alkalinity (carbonate) swings. To make matters worse, carbonate is available in relatively low concentrations in seawater, meaning it gets depleted much more easily than other elements. Calcium is important because corals use it to build skeletons, but otherwise it doesn't have a huge effect on water chemistry. Magnesium is important because without adequate magnesium levels, calcium and carbonate will find each other in your water and join together, meaning your alkalinity and calcium levels will be hard to maintain.
I'm not advocating that these are the only things in your water you should test, but these are the building blocks of seawater and some of the most important (IMO). Without accurate test results, however, it would be difficult to give solid advice on what to do.