Hello all! My LFS has a bunch of aquascaping rocks for sale. Most of them are razor-sharp, so not at all fin-friendly. There is however one type of smooth rock that I like, and I was wondering what type of rock it is so that I can research whether the rock would affect my water parameters. The...

I tried regular black Petco sand but it raised my ph to over 9 and I lost all my fish. I took it back to the store and they gave me my money back through a gift card so I could by different sand. Which Petco sand should I get? Here are the 2 that I have been considering...