I'm going to be emptying my tank completely out. We noticed some of the seals look weak and are going to be fixing it therefore it all must come out. While I'm at it I figured now is the time to change things if I want to. I currently have pea sized gravel in my tank which I don't like. It's a planted tank and somehow the plants seem to be surviving. I have 1 cory catfish and will add more once the tank is switched over. My husband likes the look of the brown gravel, he says he likes the natural look. Any suggestions on what would go well with the plants, the catfish, and look natural for my hubby?