Unless you use something like a macro algae to remove the nitrates or do a PWC
, nitrates are the end result in the whole cycle ammonia -> nitrite -> nitrate , unless there is something in you tank to use the nitrates like a ball of cheato , they will stay in you tank. Another option is a de-nitrating canister.
But once you have nitrates they will be there in the water until consumed as a food source by algae
Canister cleaning is a way to prevent nitrates from building up , but it will not remove it from the water
Best way to control nitrates is to macro algae as stated before cheato being one of the best to keep
Also clams consume nitrates .
Hope this makes sense.