Burn & spy..
I have just completed a water change of 50 gal. I dosed with kent cb part a and b. Added 3 caps of kent coral-vite, 3 caps of kent Strontium & Molybdenum, and 3 caps of kent tech.i. Changed out the phosphate sponge, rinsed pre- filters and the sock filter. Stired up the sand as I...