Just Wanted some opinions or the pros & cons on using egg crate or gravel to elevate my substrate? Im looking into getting D. tincs would it be safe to have a 3-4" deep pool or should I make a shallow one? How do show prices compare to mail order?There will be a show in me aera aug. 6 in Gig harbor WA. the cost of gas to get there and shipping will be about the same. Im hoping to have a established set up by then. Im new to this you will be hearing from me often I have lots of questions. THANKS Shawn