It doesn't sound like something that would help the overall health of a tank. Hard to say, now that you've found the problem (the leak) and can address it you can see if things start to rebound.
As suggested I would do the water changes, plus I would ensure I was using carbon actively (ie. power filter or phosban reactor) and changing the carbon out at a minimum of once per week.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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