No bad idea the sand is terminated buy new please do not add any volatile organic compounds to your reef
As bleach can be caustic and sand is cheap
Your fish will thank you
Put it this way try drinking a small amount of bleach every day and see if it would be detrimental to your health, chances are by the 2nd or 3rd day your health would be compromised
Same goes for your fish and coral
It's the precise same reason we dont use tap water if chloramine is caustic to fish what makes you think chlorine would be any different if this were the case you could just use tap water As a base
The only reef safe chemicals imo are muriatic acid and white vinegar which contains under 5 % hcl should be used to clean equipment then should be rinsed with freshwater
Rember a substrate is a substrate it's a living thing so it probably would have a smell... I dont really know what you were thinking tbh
If you grab a handful of soil what does it smell like musty old forest
This is the smell of fungi and bacteria
Or in your sands case years and years of death and decay as calcium carbonate is fossilized coral skeleton and dead fish as well as living algaes and bacteria
Y u smelling sand In the first place?
Yeah it smells its were all the poop and food goes to breakdow