This pH is a little high. You can dilute your water with distilled water, or Reverse Osmosis or RO
(deionization) usually available at SW
fish stores, to reduce the pH.
Try cooked insides of green peas. You can use fresh, frozen or canned, I recommend no salt added. Another option is live Brine shrimp. The movement of them cause interest in eating and also the can have a positive effect to move the digestive track along.