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Ok so.... 600 mh, dwc, super silver and purple, over a month old, gh nutes, silica, and hydroguard, ppm around 450. Tried to go higher but looks like I got nute burn. So plants are yellowing from bottom, showing almost striping on some leaves and have not grown in days, is it lockout or do I...

Ok so.... 600 mh, dwc, super silver and purple, over a month old, gh nutes, silica, and hydroguard, ppm around 450. Tried to go higher but looks like I got nute burn. So plants are yellowing from bottom, showing almost striping on some leaves and have not grown in days, is it lockout or do I...

Bubbleponics seedlings are almost two weeks old and only on second node. Just fed 1/8 strength flora series two day ago and ppm are rising from 100 to 120 (today). Noticed gray slime on bottom of Rockwood cubes. Am going to flush with PhD water but any help would be greatly appreciated. I'm...