I was hoping to get some advice before running to the store for sand. I had a question on using pea gravel in the bottom of my tank. I must be posting wrong? In order to be under the new posts does a moderator have to respond before it goes there? Could someone please answer my other post on changing the sand or direct me to where I need to look for answers. I have help today only to change the sand and need answers right now, sorry for the urgency. thanks in advance.