Thanks Wayne, I tested my tap water last week and it is between 0 and 5. I have been doing about 20% water changes weekly, but I did not keep up on them when I set up the tank (I used water, gravel and filters from a different tank to avoid cycling). This was about 3 months ago, and I have been doing weekly maintenance for about the last month and a half. I'm assuming not doing the maintenance from the beginning is what has gotten me in trouble :sad