DJ_$ure$hot
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If I have an Ammonia reading of 0.50ppm & I have my 1st reading of Nitrites @ 0.25ppm, shall I do a 10% or 20% water change right now? 


Hi, I personally wouldn't do a water change unless your PH levels have crashed. What is your PH level?
Ideally you want to wait to see if the Ammonia and NitrIte drop over time due to the bacteria processing it. Im sure MW or Waterdrop will explain this better than me!
Sorry I misunderstood.... is this tank going through a fishless cycle or do you have fish in there already? If there are fish present then DEFINATLY do a water change! If its doing a fishless cycle leave it..... sorry for the confusion!
Bignose has previously shown (in theory and experiment) that conducting water changes on a fishless cycle speeds up the cycle, so regardless of cycle type, water changes are good.

Bignose has previously shown (in theory and experiment) that conducting water changes on a fishless cycle speeds up the cycle, so regardless of cycle type, water changes are good.
It almost seems logical though coz you wouldnt completely dilute all the Ammonia & Nitrites with a water change, you'd just be helping the process by making it less toxic & easier for the bacteria to turn it into the safer by-products 

If I have an Ammonia reading of 0.50ppm & I have my 1st reading of Nitrites @ 0.25ppm, shall I do a 10% or 20% water change right now?![]()
I'd do some larger water changes, up to 50% at this stage, to get the nitrites down. Above 0.25ppm, ammonia and nitrite can do lasting damage, even if the fish only go through them short-term. Obviously any detectable reading of ammonia and nitrite is damaging if fish are subjected to it long-tearm. Looks like things are moving along nicely though