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Never dose without testing. For all you know, it is perfect and dosing will cause it to get too high. This is less likely with stuff such as calcium and alkalinity, but a horrible habit to get into. Even alkalinity can be a major problem if it's too high.
That stuff usually needs to be dosed daily, even if small amounts. It keeps everything much more stable. Get kits and dose according to the tests. Check out BulkReefSupply's videos and the link I posted above. They will help you get your head wrapped around all of this.
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