rocks

I've got a 10 gallon tank. I call it an 8 gallon because of the rocks in it. It's heavy flow, planted tank. I'm looking for fish that I could have in there. I was thinking maybe ember tetras. Ideas/recommendations?

Hello, I am finding myself needing to raise the ph and kh of my aquarium. Everything I’ve been reading says rocks like limestone will do this. However, for whichever reason I’m struggling to find anywhere that sells them. Is there any other rocks that will and suggestions on where to get them...