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Yes, you’ll need to replace your toilet’s wax seal any time you move the toilet. This is because movement of the toilet will break the seal, rendering the remaining wax useless. Thankfully, replacing a wax seal is fairly easy, and the seal itself only costs $2 to $10 at most home improvement stores.

When replacing a wax seal you typically also have to replace the closet bolts that secure the toilet to the flange. These are usually about 2.5" - 3" long and have to be cut once the toilet is secure. Cutting them usually makes them too short to reuse.

Yes, you should screw your flange to the subfloor, including cement. The best way to get this done is to predrill holes into the concrete using a hammer drill and a ¼-inch concrete bit. Be careful when you’re ready to bolt your flange down, as you can accidentally crack it. You can avoid this issue by not installing the screws too deep. Or, you can opt for a flange with a stainless steel ring so you don’t have to worry about cracking the plastic.

You can tell if your toilet fill valve is full by removing the lid and taking a look. When you flush the toilet, the float is at the bottom of the tank, the water empties, and the fill valve opens. The float rises to the top as the tank fills again with water. When the float rises to the right level, the fill valve closes; if the valve is too high, your toilet may only partially flush, requiring you to adjust the float. 

If you notice water leaking down the side of the bowl or tank and you don’t notice any cracks in the porcelain, the odds are that it’s condensation. If you notice water around the base of the toilet, this points to a leak. Check for loose bolts. A sewage odor may also indicate a broken toilet flange.