what is the best medium to use when growing with led's?

Hi

can anyone out there tell me what is the best medium to grow in when using led's, I have 2 jumbo 180 ufo's and at present I am using bubble pots with dutch master gold nutrients but this is my first try with led's. I have always used 600w hps before. I read somewhere that keeping the water cool enough is a problem as the room has to be heated to 85 degrees
 
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