That looks like "Super Naturals Amazon" gravel. If it is i just finished swapping out all of my sand in my ca tank for this and am really pleased with the result. I use 2 hob's for my tank and was tired of watching my fish swim around spitting sand in the intakes. I bought some spare aquaclear sponges and put them over the intake but it was a real eye sore for me. My opinion is the gravel looks nice and natural. I would leave it as is dude!
