I would like to use sand for a 55 gallon setup that I am planning. I read in a thread here that play sand can help control your ph by raising Kh? I may have mis-understood. What would be the best sand for my situation? I have hard tap water and high ph, around 8. I have not purchased a kit that tests for Gh and Kh, but plan to soon. I currenty have plain pea gravel in my 55 and the Ph is close to 7.8. I would like for it to be as close to neutral as possible without using chemicals. I would prefer to stick with a tan colored sand, as I like the natural look to it, and I may mix some of the pea gravel with it. i plan to house a few clown loaches (I know, size, bigger tank) with some slate pieces and driftwood and hopefully a ew plants.