That is good. The fish oil is a protein booster. I always give it to my weak chicks and adult birds. It will stay in their system longer than the sugar water. The capsules would work if you break it open and get the liquid onto a chopstick/skewer or a syringe. Then drip it into the chick's beak.
I gave her fish oil, I broke the capsule open and squeezed it and she got some off of it. I put her back in the box and she laid back down.