What is coral snow? How is it supposed to work? It's pretty expensive. I've read the description and its some sort of 2.5 micron carrier mineral that clears water and that corals ingest with whatever supplement you add bound to the carrier?
I would love to see it in action.
If you print a page of various size text on an 8.5x11 paper and tape it to one end of your tank - so your looking through the tank lengthwise - then go to the other and take a few pictures zooming in on the print as needed then
dose wait, for the recommended period and take the pictures again keeping the settings, zoom and time of day the same as the first set of pics. If it really works and isn't placebo effect - it should be evident.