I found this today and was really excited. It has some semi sharp edges so I was thinking about getting a dremel after them to soften those up. I initially thought this would be perfect for some kuhli loaches hiding in and out, but now I'm reading if it is Texas holey rock, it raises ph. Does anyone know how much it raises it? Mine is sitting at 7.4 in our 20gal, and I want to put this in my new 38 gal I'm going to start up next week. It looks so cool, so tell me what you think. It's a good bit whiter, I just rinsed it off so it's more gray right now.