From what I've read, dechlorination and dechloramination takes place immediately after adding the water conditioner. However it must be mixed thoroughly with the water. You can use a clean plastic spoon or similar tool to stir the water after you add the conditioner to thoroughly mix them.
Keep in mind that some water conditioners do not remove or detoxify ammonia which can be toxic to your fish. You need to use a water conditioner that detoxifies ammonia and not just remove chlorine/chloramine.
If after doing a water change, you see your fish struggling to maintain balance like being sideways upside down etc, then it is definitely the new water. Only do partial water changes and not complete ones. For small bowls that are about 1 quart you can safely do 50% water changes every 3 days. For larger 1 gallon bowls you can do 25% water changes every 7 days. I would recommend you set aside pretreated water that you can use to make these water changes. This way the water will be similar in temperature. Just make sure this pretreated water isn't sitting there for months accumulating dust and bacteria..
I have a couple of questions for you. When you do water changes how much water is being changed? How do you remove the fish? Do you use your hand, net? How big is your fishbowl/tank?
Anyway the easiest way to do water changes for fishes in a bowl with gravel is to pour some of the existing water into another spare container which you use only for this purpose. This spare container must be clean and never washed with soap. It should only be rinsed with regular tap water after each use.
Now take out the fish and put him into the spare container that you poured the exisitng water into. Make note that you will be keeping the water in this spare container so it should be a good amount of water from the main bowl. The amount depends on the size of the bowl.
Next take the dirty fish bowl and rinse the gravel leaving the gravel inside the bowl then pour all the water out. You can use untreated tap water for this step. After it's rinsed pour some clean water you have set aside into the bowl with the rinsed gravel just enough so that the gravel is submerged. Swish it around and pour that water out. Now pour some clean treated water into the bow then pour some of the water from the spare container into the bowl. Now take the fish out from the spare container and put him into the main bowl. Finally pour the rest of the water from the spare container into the main bowl and you're done.
This may seem like a lot of steps, but it is fairly easy and safe for the fish. After you do it a few times it becomes second nature. <img src="/images/graemlins/grin.gif" alt="" />
Make note that if your fish is not feeling well, this water change method could still be used as it provides a minimum level of shock, but it is not a cure for the fish's condition.
Last edited by PaPeRo; 11/05/06 09:27 AM.