Red mold?

Over the past few patches and spots on my rock wool cubes started to turn a red rust color. Its only on a about half of them and the other dont have any sign of discoloration.It seems to be only on the top of the cubes on the surface not discoloring from the inside out. I had a nutrient burn a week ago so Ive only been watering every 3 days with 5.9 ph water. Any help on what this is and how to stop it would be appreciated.

Looks like some nutes got burned by your light, when they dried. I wouldn't worry about it. I would worry about that one clone in your first picture. You might want to chop that dead stuff off, spray w/ seltzer water and dome for a few days. If you want to get rid of that red stuff, you could try diluted h2o2 or ph water, but I would just cover it w/ some panda paper w/ a slit to fit around your plant.

what kind of water are you using ,that almost looks like iron ore in the water,dont no though just a opinion

warble said:

Looks like some nutes got burned by your light, when they dried. I wouldn't worry about it. I would worry about that one clone in your first picture. You might want to chop that dead stuff off, spray w/ seltzer water and dome for a few days. If you want to get rid of that red stuff, you could try diluted h2o2 or ph water, but I would just cover it w/ some panda paper w/ a slit to fit around your plant.

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Thanks for your prompt advice. Ill try that panda paper technique. Yeah initially i got nutrient burn on those little seedlings, ill try taking off that dead stuff and dome em. Thanks again

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old shol4evr said:

what kind of water are you using ,that almost looks like iron ore in the water,dont no though just a opinion

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It has almost the exact coloring of rusty iron. Im using city water its between 20 and 30 ppm out of the tap