I'm here in Florida as well. Since it's heating up, the evaporation level will start to pick up. General rule of thumb is anything more than 1/2 inch a day, and you need to watch it.

In addition to doing the bucket test, at the same time take a pencil, bend over the edge of the pool, and mark the level of the water on your tile.

This will give you a second reference point to the bucket test.

Check the level of the pencil mark, versus the bucket marks on both the inside and out to double gauge what's going on.