White Widow Bubbleponics Grow

That sir is magnesium defficiency. I know it sounds weird but if you are using stealth hydros nutes STOP they are HORRIBLE found this out the hard way. Also what kind of water are you using to fill the res up? If it is tap water and you are not letting it sit out for atleast two days you could be accutally burning your plants by giving them nutes. If there is to much of a bad thing in the water it creates nutrient lockout. Therefore when you think you are doing something good by adding nutrients you are accutally creating a poison in the res. I am growing some auto ak47 right now on day number 61 so close to harvest anyways....... About 3 weeks in mine starting getting those little brown spots all over the place slowly spread all over the plant. Add some a teaspoon of epsom salt for every gallon of water you use. Also I would go with a 3-4 day straight water flush no nutes.

And ya now that I re read sorry I found something else I just noticed you had just switched to the bloom nutes thats the same time mine started doing this. I had to much chlorine in my water creating the nutrient lock out which if I'm not mistaken looks almost identical to my plants when it started happening. This is just three pics from when it started to what it ended up looking like pretty ugly lol. Oh well still got weed on the plants

sorry about what happened to your little baby girls...
=(

that sucks.

well I'm aboard for this grow. Believe me, if I had the experience
I would tell you how to fix it, but I don't.

I can only say good luck and hope they recover.

If I've learned anything from reading on this site everyday,
its that you should probably do a good flush. And if you think

that you have algae growing, clean out your rez very well. Fix
some hot soapy water with 2 teaspoons of bleach to kill anything
thats growing in there. Bleach kills all kinds of fungus and bacteria
the best. So do that. And be sure to let your water sit out for
a minimum of 2 days (if its tap water) and check the PH and ppm
daily to make sure its where its supposed to be. Good luck.