Root Checking

Hello, I have finally got my hempy buckets set up with four clones for my first grow. I have added the nutrients I've deemed necessary for starting clones by reading other posts. The problem is I don't know how to tell if the roots have reached the reservoir. Everyone talks about how that is a pinnacle moment in the grow and signals an increase in nutrients but I don't want to just go digging in my medium right? How do I know?!!
 
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