White fibers growing under my rockwool

I have been noticing sometimes massive white fibers growing on the bottom of my 3x3x4 rockwool cubes I'm using to germinate. I'm using, weakly, Superthrive, fish fertilizer, Western States B-1 with minor elements and chelating agent. I've begun adding a few grains of miracle gro because I have nothing else, and some of my plants will be showing their first true leaves in a few days. I would appreciate any advice at all.
 

cannabineer

Ursus marijanus
You've got a wonderful brew of micros and fish there ... and it's feeding a fungus. Those are some awful big cubes for germinating imo. I would counsel much smaller cubes moistened with pure water after you've pH-corrected them. cn
 

red0021

Active Member
I have been noticing sometimes massive white fibers growing on the bottom of my 3x3x4 rockwool cubes I'm using to germinate. I'm using, weakly, Superthrive, fish fertilizer, Western States B-1 with minor elements and chelating agent. I've begun adding a few grains of miracle gro because I have nothing else, and some of my plants will be showing their first true leaves in a few days. I would appreciate any advice at all.
You shouldn't be giving them any nutes at all.

White fibers? Are you talking about the roots?
 
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