I have an established 5 gal
with 3 Red Phantom Tetras and 1 Blue Tetra (I may move the Blue out to a 10 community tank that is now in the middle of a fishless cycle). I learned through experience that the tetras were happier with lower light levels. For nearly a year they thrived with only natural light. Recently I dampened the bulb with duct tape (use number 1001 LOL
) and now run it on as normal. More to my question, I recently learned through net surfing that they prefer a lower pH. My water is on the higher side, 8.0. Is there some rock material that can naturally buffer the pH? Should I try to chemically manipulate the pH in my water changes? Or should I leave well enough alone?