#ed_op#DIV#ed_cl##ed_op#FONT size=2#ed_cl##ed_op#P#ed_cl#I was just wondering if it would be OK to take half of my gravel out and put some sand in its place. And I have another question is it beneficial to put fiddler crabs in my tank b/c they are all over the beach and i thought they might help eat some of the algae. #ed_op#/P#ed_cl##ed_op#/FONT#ed_cl##ed_op#/DIV#ed_cl#