There is some clearish white foam forming to 4 of my 6 net pots in a DWC system. The foam is clear and does not smell. Ph is at 5.9 to 6.0 and ppms are 1100 it is a 7.5 gallon res temps are 70 to 74 tops. Oh yeah for nutes I'm using tenaflora plant are 3rd week of veg. Any ideas would be great thanks.. and should i be worried about this foam??