graham john
Aquarium Advice Newbie
- Joined
- May 11, 2011
- Messages
- 1
Hello everyone i am new to this site. I have a 90ltr tank which has been running for 3 weeks, i have guppys,mollys ect all my water readings where fine until i introduced a under gravel filter (i have 2 pump filters also) my nitrite level has gone from 0.3mg/l to 3.3mg/l, i have done a 30% water change, i have also changed the mediums in my filters could this be the problem. Please help. Graham