Tested water when I got home and ammonia is now 0 nitrates 0 nitrites 0
Should I just wait until I see a nitrate peek and then do water change?
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Once you have stable test results, meaning zero ammonia and nitrite, and nitrate at whatever (provided it is low), you go into a regular routine of partial water changes. No less than once a week, and a significant volume, say 50-60% of the tank, is my recommendation. The larger the volume of the water change, the more effective it will be. But except in unusual circumstances or emergencies, once a week should suffice.
I agree with other members who have recommended removing some of the fish, particularly the "shark." Not only does this fish get large, it must have a group (it is a shoaling species) and this means a very large tank. There are other issues I won't get into, but if the store will accept it, now is the time to do so.
Byron.