01-08-2007, 12:07 AM
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I am wondering if we know why the pH crashed? Did you also test nitrates? How you fix it will partly be dependent on what caused it. Have you tested the pH in your tap water? What kind of difference is there from the two? How often do you do water exchanges?
Be very careful not to bring the pH level back up too quickly, as this will shock the fish and can easily kill them. You can go to your LFS and buy a bag of crushed coral, put some into a media bag, and put this into your filter, but watch that your pH doesn't go too high over time. If there is something specific causing this problem and the tap water tests higher than the tank water, then simple SMALL water changes, about 5% each day, will also raise your pH, and won't cost anything or cause any hassle.
I strongly urge you to find out what caused this, as pH fluctuations can be very deadly to the animals, and are usually preventable.
If you post the other test results, we can help you to sort it out.