I am a newbie tomato gardener. My 6 tomato plants are in large pots on the patio. They have received only the best treatment - they were purchased at Northaven Gardens, have been potted using organic soil & compost, Garrett Juice, etc. They have grown well overall, but are beginning to show some limp leaves and lifelessness. I test the moisture, light and ph levels. Moisture level is fine. Light is fine - they are all on rolling plant caddies and get rolled to the sunshine as the day goes on. But my pH is 8 in all pots, very alkaline. Does anyone know what would be best to add to potted tomato plants in order to to get them into their proper pH range?

The limp leaves makes me think that you might be overwatering. Make sure that the soil does not stay constantly wet. Usually when the soil is too alkaline, the new growth leaves are yellow. Have you seen that also?