This pool is about 10 years old. The gap was caulked for the first time in 2011. I don't know why previous owner didn't caulk it for 5-6 years. When I calked it , I noticed deck moved on other sides of the pool (raising some places, moving away making gap larger in other places), but nothing changed since I calked it (in 2011) and this side was good until this winter. I just lifted the cover and I see the deck is about half an inch above the cooping. I hope it's deck moving and not pool sinking.
Should I be concerned now? If so, what should be done to prevent it from moving more? Should the holes be drilled and filled with cement or something? What cost am I looking at?
Also, I've never peaked at the skimmers before, but the whole thing is in ice, while pool water level is about 1 inch below the skimmer. Is it normal to have ice in the skimmer considering that I pored about a gallon of antifreeze there? I guess rain got in there and displaced antifreeze. Hope piping is intact, this winter was brutal.