How many times you do a w/ c in one month

  • We are currently upgrading MFK. thanks! -neo
every Sunday 40% on all 11 of my tanks....more if i feel the tanks need it..so 4-5 xs a month.
 
weekly 10% change with 1-2 25% changes per month.... so 5-6 per tank each month total I suppose.

I feel like the 25% changes stress my fish out a little bit, but I can do the 10% changes without really bothering them.
 
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