High Nitrate for over a month...
Have a 100gal freshwater community tank.
Includes: Botias, horseface loach, harlequin rasboras, hatchetfish, and 2 bushynose plecos.
I have seen every fish except the horseface loach, which is common.
Have been feeding frozen homemade food to botias, and flakes/brine shrimp/bloodworms etc to others.
They fast once a week.
Water change - every 2-4 weeks ~10-25%
Have all live plants, with eco-complete substrate. Rena canister filter (4boxes).
Clean parts of the filter out every couple months. (usually the mechanical filtration. will sometimes rinse SOME of the biological. change out carbon.... maybe every 6-8 months. have never had any problems with the tank till now. did change the carbon about 2-3 months ago, and recently added biozorb to the filter)
tank has been up and running for 1.5 years.
Every week i take away dead plant matter from the bottom (that i can see).
nitrate has been high for about a month now, ammonia and nitrite 0.
-the beginning of the week the nitrate was at 40ppm. i have done 3 water changes, 2 with gravel vac, in the past two weeks to clean out the plant bed.
The nitrate now sits around 20ppm
any ideas why it suddenly got so high? and how to fix the problem? I know water changes, but anything else?
Last edited by nik8806; 10-31-2010 at 04:49 PM.