I am in the process of planning a paludarium. One of the biggest chalenges is how to set up the land area. One of the methods I was considering was just piling pool filter sand (already being used in the tank) until it was about 11-12" high oo one side of the tank. The pool filter sand in 1-2 milimetres is diamater. Is there likely to be a problem with developing anaerobic pockets by following this course of action?