Review on Premium 2lb River Rocks for Glass Vases, Aquariums, and Terrariums – Natural Polished Mixed Color Stones to Elevate Aesthetics by Brian Kumar

I did not boil these stones but did rinse them well before placing a full bag in a 29 gallon tank. Within 3 days they all grew into porcini, so it must have been something acting as a nutrient in/on the stones. Antifungal treatment of the tank was ineffective. The fish has apparently not become infected with the fungus. White hair fungus only grew on these stones and not on the gravel already in the aquarium (which is much smaller, so it was clear which stones were which). I had to remove these stones with pliers and ended up throwing the furry stones away. As always, the service from Revain was top notch. I hope others have better experiences with these stones - maybe they know how to prevent this?