FWIW my tank is pretty dirty rn b/c I've been busy and haven't done a WC in over a month -- the sand and rocks need a good clean and they just visually look a bit dirty. But my water has been crystal clear ever since I started using AF Life Force and PNS Substrate Sauce. I have a max nano and have always run carbon/chemipure blue/elite and a filter sock w/floss on top, but since using those two products the water has been noticeably more clear. Not sure which product was responsible or if it was both together, but my thinking was something must've changed in a good way w/the microbiome.