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Hi caroleigner1, Short answers:
pH: Optimal pH range for the TG is 5.5 to 6.0. FYI: pH Nirvana in the Tower Garden
TDS: This value will vary greatly between TG growers. To find your value, you first need to establish a baseline. I recommend you look over this doc: Consistent Nutrient Levels in the Tower Garden
BTW... 6 tomato plants in the TG is way too many. The recommended max number is 2 (kept on the lowest growing port section of the TG. Also, be sure that you do NOT start seedlings directly in the TG. Seedlings should only be placed in the TG after you see roots exiting the rockwool cube. And then, you should use 1/2 strength nutrient solution (10 ml A+B / gal. water) until the seedlings are more mature. FYI:
Thanks so much for this info. Hubby will happy as this talks in his language! LOL!
Tower Gardenguide says ph sb 5.5-6.5