The blueberry is definitely struggling in the high pH soil. Your soil is too sweet; blueberries like it acidic. You can repair it. We would cease the hydroponic solution; honestly, we are not familiar with it in this application. Get gypsum, as mentioned above, or aluminum sulfate and sprinkle it on the soil. Work it in, and water. Mulch can be moved. Change yours to pine needles, if it is not. See more about bluebery bushes: /plant/blueberries
Overall, depending on the proximity of the blueberry and olive, you may have to move one or chose a favorite. Or get a blueberry bush that will thrive in a pot.
The blueberry is definitely struggling in the high pH soil. Your soil is too sweet; blueberries like it acidic. You can repair it. We would cease the hydroponic solution; honestly, we are not familiar with it in this application. Get gypsum, as mentioned above, or aluminum sulfate and sprinkle it on the soil. Work it in, and water. Mulch can be moved. Change yours to pine needles, if it is not. See more about bluebery bushes: /plant/blueberries
Overall, depending on the proximity of the blueberry and olive, you may have to move one or chose a favorite. Or get a blueberry bush that will thrive in a pot.