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I was wondering how long can I hold off doing a water change for my CRS tank?
Main reason-being I do not want my berried females mOulting and I don't
Want to upset any shrimplets either.

It's been a month already since my last water change.
What is the main reason for water changes?

If it is due to nitrates then I've got seachem purigen
In my filter keeping it at zero.
 

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The longer you go without water changes the higher your TDS will get. Topping off with pure RO water will prolong the time between water changes.

Your berried shrimp CAN molt without dropping her eggs. Berried shrimp generally drop eggs because of stress (water parameters, etc), or because of lack of experience carrying eggs.
 

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Water changes is mainly to get rid of nitrates, renew the minerals and lower the TDS.

Id still do a water change every 2 weeks, just do a slow gravity drip using a air pump hose.
 

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I understanding not wanting to upset the balance that you have, that is admirable. One thing to think about though... Mother nature changes all the water all of the time. The water these animals come from is constantly being refreshed by natural processes that we as enthusiasts do our best to mimic for optimal quality of life and the least amount of stress.

Change the water. Remember nitrates is just a nice way of saying the remains of waste and no one wants to swim around in that.
 
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