Best sand for a planted tank
So I'm having issues with my water and I have been told it is due to my gravel from petco, it's a painted gravel. I'm wondering what the best sand is or if there is a difference in sand brands. My local petco has black sand made by Imagitarium. I know it's not good for heavy rooted plants but I don't have any of those which I'll be planted into it. Also, should I add anything below the sand? I don't wanna get the fancy substrate because it comes in huge bags and I have a 6 gallon shrimp tank. Any suggestions ladies and gents?