Can I Avoid Additives?

acrylic300

Member
I'm comming up on the 3 month mark. I haven't done a water change yet. My Alk and PH levels are starting to drop Calcium is about the same.
Will a 20% water change every 2 months be enough to eliminate this?
Ph 8.2 Drop to 7.0
Alk 300 Drop to 225
Cal. 450 same
Nitrates 20
Im only raising soft corals and fish
 
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