ya I think you are headed for problems. I'd stop the minute maid activity now. Start using lemon juice or go to home depot and purchase some muriactic acid which will be located near pool supplies. I would use a ph pen to see exactly where your starting ph is and then add small amounts of the acid or lemon juice to bring it down to about 5.8. The sugars and other chemicals will find their way into your plant. The sugars alone may throw the plant out of whack. There is a ton of sugar in minute maid drinks.