I like the look of a black water tank but I am not really interested in lowering my ph. Everything I seem to read says to not try to adjust your ph up or down. I added a glass of black tea to my 40g dwarf cichid and tetra tank and tank does look darker. Would tea lower the ph. Has anyone ever tried this? The darker water is causing my ph test to show an odd result which I think is due to the coloring of the water. I am sure the ph didn't go up from this. The fish seem to be ok and I like the look.