I have a 75gal FOWLR and I have 2 aquaclear 500s. One with foam and bio cubes and the other with foam and charcoal. I'm looking at getting a skimmer, maybe a remora pro. Do I need all this, and do I need charcoal?
Polishing the water is just the removal of small particles that can make your water less clear and it will remove any odor. I run it for 2 days and then trash it. AC is only good for about that long in FW or SW.