Doing super frequent water changes.. what can go wrong?

[Red Coral Aquariums]

Originally Posted by kien

.. thinking out loud here.. I wonder what would happen if you did frequent enough water changes to the point where the water in the tank was (nearly) constantly equal to fresh saltwater. Like say 90% fresh saltwater all the time?

I would be nervous about losing your beneficial bacteria causing a mini cycle. I've seen a tank crash from 3 times 60% water changes and each one was done daily. 4 th day before h2o change ammonia reading was 3. This person wanted to bring down his nitrates from 20 to 5. He saved his tank by doing 10% daily water changes for a week. Subsequently after that week his nitrates were 7.

Kevin