When you treat the water during a water change, do you treat the amount of water you are changing, or the total amount in the tank? I.e., you're changing 10g of water in a 50g aquarium - do you dose for 10g or 50g?
I've been dosing just for the changed water, thinking that the water in the tank has already been treated. So, for each 3g bucket I fill, I treat 3g. But, I always seem to have some ammonia in my water (and do test + for ammonia out of the tap as well). In researching Water Conditioners, I came across this blurb;
DOSAGE WITH LIQUID AMQUEL+ PRODUCTS
... When treating the water, the total volume of water should be treated per dose, not just the amount of water added. http://www.novalek.com/kordon/amquel+/index.htm
I haven't seen any equivalent instructions on the other Tap Water Conditioners I've seen or used (API Tap Water Conditioner, API StressCoat+, SeaChem Prime).
So, how do you guys go about treating your water? If you dose for the whole tank, do you put the entire dose in the first bucket, split it up evenly between buckets, or add it to the tank directly (i.e., using a Python)?