I have been doing a 10% water change on my 16 gallon weekly. How often should I be testing my water, and what is most important to test for. I currently have 2 clown fish and 1 blenny for fish. Softies and LPS for corals.
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Less than a year old, you might want to test as above weekly until you are sure numbers are stable. Then it's up to you, assuming everything looks ok.
Salinity can be controlled best with an ato.
We have a 11g aio with clowns, zoas, LPS and favia. Gets a water change every 2 months, no testing.