Mebbid
Aquarium Advice Addict
Just to make sure, but you're not dropping salinity on a tank that contains live rock, corals, inverts, or a copper treatment are you?I am using API test kits and a hydrometer. I was doing fortnightly wc and just once stretched it to 3wks with the larger tank-testing all the while. I am doing my 3rd wc in as little as 10days right now. Replacing with RODI at the moment, dripping around 40-50 litres to bring the SG down.
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Hyposalinity kills inverts and coral including many of the things that are on live rock such as sponges which could cause a huge ammonia spike.
Combining hyposalinity with copper is also deadly for fish.