Today George and I rechecked our pH levels in our water. Our water is very high with a pH of 8.5 or greater. When testing it at first, we had added more water. I figure that the tap water here is more alkaline than it is acidic. We tried using a pH down solution but that was strictly for hydroponic nutrient solutions only. We found some aquarium pH down and used that instead. The recommended dose was two drops for every gallon of water, so 10 drops. After doing so, we let the system sit for an hour and a half and the pH was still over 8.5. Even after class, we added close to 15 or 20 drops and still no change. We are worried that the pH down(which is acidic) may harm the fish.