I was deciding to switch to sand this is the sand i want to get this sand CaribSea Super Naturals Moonlight Sand Premium Aquarium Substrate at PETCO its white i heard that you have to have a 2 inch bed and you should get a pound per gallon. That would turn out to be $45.81 and i dont want to pay that much and i really want white sand. Any other advice about switching to sand . And if my fish will like it down below they are