hu guys.....
ok as the tiltle above can i use sand that is already a shallow sand bed in my tank for 3 years already..........
the situation is this.... i decided to go for bare bottom tank........ it will be a waste to throw away the sand especially it is branded sand caribsea aragonite sand........
my question is that can i use a portion of the sand as a calcium reactor media????? the sand is still in its original form quaker oat like bits............