water change question during cycling?

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Travis32

Aquarium Advice Regular
Joined
Jul 5, 2015
Messages
86
I am just curious on peoples opinions. My tank has been cycling for 3 weeks now and am just curious as to when I do water changes, should I just replace the water, or should I actually dig into the substrate and get what I can from there, or possibly just skim the top of the substrate? I just didn't know if while the tank is cycling if I should leave all the stuff in the substrate or not? I am using a fish-in cycling with 7 zebra Danios on a 75 gallon tank. Thanks
 
What are the parameters?

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