monisaab said:
I just want to know if there is a limit on water change???
How many times can I change the water in a week and how much of it can I change each time???
Depends on the fish and you're water source. If it's a good water source, meaning agreeable to the fishes, then there's no limit really. My tap has never bothered my fish, so I could easily do 50% changes daily or more. But, obviously I don't.
More details might help us to give you a better answer as to what you can do.
Have water changes ever stressed the fish you're currently keeping?
What is the KH, GH, and pH of your tap?
What fish are you keeping, approx age, size, etc?
Tank size, filtration or any other details?