My PH is very high 8.4 and I am trying to lower a bit, I added a piece of driftwood today, I think I am right in assuming this should lower my PH. I wanted to have tank devoted to Bala sharks but I have lost 3 already which I believe is because of my high PH. I had the fish store test my water and I also tested the water and nitrite and ammonia are fine. This tank is 150 gallons let it cycle for a month then added my 4 neon tetra from my old tank and they are doing great but when I added the bala sharks they looked good for 4 days then one died then 2 more the next day 3 are still living though. I asked the fish store for some "hardy fish" and now I have 3 platys and 3 mollys in the tank. I guess my question is what is the best way to get the PH down or should I not mess with this and just look for fish that dont mind high PH (if there are any?) btw my GH is 14-15 which was high on my test kit. any help would be great, this is a very cool site