brown in the middle

All is not well in my grow room. I am running 11 plants, 6 mango and 5 of an unknown strain. The plants are growing via DWC on the Bloom Yellow Bottle program. The 6 mango are doing fine, while three of the others are not doing so well. The leaves are beginning to turn brown from the center outwards. What worries me more is that this appears to be happening primarily at the top of the plant. I have space to allow the plants to continue growing, but I am worried that it will spread to the healthier ones. Any suggestions, about the source of the problem or whether or not it will spread, would be greatly appreciated.
 

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I hope they survive i dont have a sulution being a newb but you some to of put alot of time in those plants they gotta be a month at least.. Best of luck
 
eddie,you have to post your info to get help brother.what's the ppm's?what's the ph?If all else fails,empty out all of the water and newts,starts fresh,let them sit in that bucket of 0 ppms.Give it some cal-mag and newts...Flush her first!
 
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