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I have 2 coral catsharks and I want to keep dissolved oxygen saturatedI agree with Bryan, I would run any coral tank, even softies, at 35 ppt. I do think it's "ok" to run some hardy softies at lower salinities, but for the average reefer, I'd ask why? The savings in salt is insignificant for home hobbyists, unless this is a large, fish-only tank with just a few softies here and there. If you would like to keep a coral tank, shoot for 35 ppt would be my suggestion
Good luck!
I did not realize you were keeping cat sharks. I think that @Jay Hemdal and @vetteguy53081 would be best to guide you hereI have 2 coral catsharks and I want to keep dissolved oxygen saturated

Haha no thank you I have kept the coral catsharks happily and healthily for years now. Only questions I have are the ones posted.I did not realize you were keeping cat sharks. I think that @Jay Hemdal and @vetteguy53081would be best to guide you here
Best of luck!