water changes can you do to many

I recently has a nitrate problem that occured after moving the tank...I think the excess crud that was stirred up by the move cause it, although not sure.

I did 2 50% changes over the course of 3 days to no avail.....
then I did 2 80% over the course of 2 days and BINGO....got them down to 5ppm and staying steady so far and its been a week.

I think the key for doing over 50% water changes is having the new water as close to old tank water as possible. Mine was **** near right on the money
 
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