Clones from aeroponics.

Greetings, i have simple aeroponics box which consists of 5 aerostones/bubblers w/ about 20 clones on top. Its been 8 days since cutting and none have shown any roots. It seems it should not take this long. In the past it took about 7 days for roots to show. The mother is an OG Fire under 400watt hps in a well ventilated room. Any advice/ troubleshooting appreciated. Thanks.:joint:
 
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