well they say that the faurna lives the sand lower then 2 inches, which would mean 3 inches is considered a DSB
, but i would still go with 4-6 inches of sand bed.
doug i have no proof that in nature they will not die from ich, it has not been proven but when a fish is less stressed their immunities are higher, just liek any other living organism.
who says a extremely healthy person that works out every day, never smoked a day in their life or had a family member smoke, always ate healthy would never develope cancer or die of a stroke or heart attack.
i know one person, worked out all the time ate right always healthy and he got cancer, it was my cousin, hes all better now and hes past the 5 years of remission but he was healthy and active and still a disease found him