I've got a problem. Just over a week ago, I did a massive pruning and cleaning of my planted tank do to algae. I cleaned 1/2 of my canister filter spunges and changed my filter floss. Cleaned the glass, vacuumed the substrate, and did a 50% water change.
Problem is, I think I went over board. I now have to change my water everyday because my Nitrite is high, about .5 ppm everyday. I know it should be around 0.

Question is:
1. How high can my Nitrite be before it is bad enough to kill my fish.
2. What should I do to get my bacteria back up to handle the high Nitrite.
3. What about my ferts, do I continue with dosing?

What I am doing now everyday is in the evening I change 50% to 60% of my water and dose a full dose of macro ferts for the week everyday at water change, and Micro ferts in the A.M. knowing that tomorrow I will change my water again until my Nitrite goes back down.

Thank you

Joe