I use ascorbic acid in all of my cichlid, pleco, and bottom feeder tanks. I don't use it for dechlorination though. I add ascorbic acid to my tanks for several other reasons: Acorbic acid aids in disease prevention (by killing it in the water), it boosts the immune system of the fish, and it makes their colors more vivid. I forget the exact dosages, but I found the dose online. I pre-mix a batch of the solution in a gallon jug before adding it to each of my tanks. I did the math once to figure out how much ascorbic acid to mix with the gallon of distilled water and how much of the solution to add to each tank and now I just go with that. I have a good many tanks, so I made my solution strong (so I would only have to use 1 gallon at each water change) and then I dilute it farther by adding it to the tanks after water changes. Once you find the actual dosage amount you can do the math for your own solution percentages and tank doses. Remember though, ascorbic acid is light and heat sensative so it must be stored in a cold dark place. I keep mine in a blacked out zip lock bag in the back of my freezer. One other warning, using too much ascorbic acid can affect the pH of the water in the tank.