Starting a reef tank can be exciting! Once you get into corals you will soon discover the need to dose.. but how do you know when you need to start doing?
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Red Sea Part A http://amzn.to/2Csvh5P
Red Sea Part B http://amzn.to/2FfkGys
Red Sea Part C http://amzn.to/2CtP84P

DIY $6 Dosing bottles    • DIY $6 Dosing Container from a VOSS W...  

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Just starting out kalkwasser in your top off container is likely the easiest way for a low demanding tank.. however, i would suggest many convert to 2 part as they start a mixed reef tank or once the tank becomes heavily stocked with corals

If you have your own question let me know at http://reefdudes.com/ask