
Yep keep the FC up at/or slightly above 12.5 ppm as much as possible. If the CC keeps dropping and if the water is starting to clear, I would plan on doing an OCLT tonight...see: http://www.troublefreepool.com/pool-school/overnight_fc_test
You can go either way on the make up water. If your level is high enough to not starve the pump, then I guess I would leave it.