Help Pls Brown Stuff in my DWC

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Hello there i have a 60 days lemon in dwc of 12 lt running for 2 weeks. I use tap water and i just started the AN grow program, with 10
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ml Sensi Grow A + B, 5 ml Voodo Juice, 5 ml Piranha, 5 ml Tarantula and 5 ml B52 in a 12 lt reservoir. My temps and humidity are in the normal range, the water temp is around 22 -23 celcius and ph ranges from 6.2 to 7 which i control it with ph down. On Sunday I started the feeding program i mention above at those ratios and yesterday i saw change in the colour of the roots. Pls any help will be appreciated, here are some photos, the top of the plant looks gr8. Also i didn't notice any weird smells just those of the AN nutrient, especially the B52. Thnx a lot
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It's most likely the B52 clinging to the roots. Gently see if it will wipe off, or if it has a slimey feel. With water temperatures that high you're going to need some beneficial bacteria in the reservoir. Consider some Hydroguard, Sensizym, or Z7...Before you need it !
 
Gm and thnx for the reply, i ll try that, i use the voodoo, tarantula and piranha at the moment but i have sensizym so i ll add that too. Yesterday went to the grow shop the guy told also its is probably a stain due to the increase of nutes. I changed the water with much less nutes, and i'll monitor for the next couple of days. He told me if it doesn't lose this colour to use oxyplus. Thnx again.
 
If it is nutrient film clinging to the roots you will likely not get rid of it with oxyplus. Anytime reservoir temps are above 70F you should be using beneficial bacteria. Don't forget when you're having to add a quart or three a day to top off the reservoir to treat that ingoing water also.
 
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