about a month ago i added sand to my tank and now the top of the sand turns brown every day. I know it must be algae, but i have snails and crabs. what should i get to make it disappear?

Diatom algae. Everyone gets it here and there. Red leg crabs eat it. But its a nutrient problem.

it's a natural occurance in a cycle too.............when i had it i took a turkey baster every day and gently blew it up into the water column and let the filter take care of it - - -during those weeks i doubled and even tripled up on the filter maint to as to not reintroduce that crap into the tank again

Boss