Hi all, need your advice on below questions:
1. How many PPM of Nitrate is safe in aquarium?
2. Read a post that if all NH4, NO2 and NO3 are zeros during new tank cycling, it could be that the tank never went through ANN cycle. Is it true?
3. Since Nitrate is the final product of ANN cycle, will it finally reduce to zero? Today is the 18th day of my new tank cycling, the NH4 is 0 (first measure was 1PPM), NO2 is 0.1PPM (it was around 0.3~0.8PPM) and NO3 is around 5~10PPM (it was around 20PPM). Can I say that my tank has completed the cycling and it is ready for LS?
4. The filter wool is very dirty. Should I just replace it or clean it? I heard that it might contain beneficial bacteria? Is it true?
5. I have just measured my tap water using API NO3 test kit, the reading was 0. Read from forum that it is better to treat the tap water with Crstal Pro before pump it into the fish tank. Anyone has experience with this product? 3 stage or just single stage is good enough?
6. What could be the source for the high NO3 in the fish tank? My existing 1 1/2 ft tank read >40PPM. How can I reduce it? Do a water change?
Please help.....