Yep, red food stains the poo and gives us all a heart attack. Heads-up, pomegranates do a dark almost black poo (reddish/purple), purple carrot also has a bit of a purple tinge to it, goji berries have a bright red stain, fig does this nasty brown splat. Oh, and sometimes their food stands the sides of their beak where there's skin (I gave red capsicum and butternut squash, and I thought his skin was raw).
Do be careful with the pineapple - our guy found it too acidic and gave him really watery poops (like diarrhoea). I almost hauled him to the vet, but waited out for his next 2 meals to cycle it out of his system.
When he's through this bout, do keep up with his syringe training. About once a week or so, we offer him coconut water or probiotics (sweet-tasting) via syringe. He's built up a strong positive association with it, so he typically only rejects it when he's really sick to the point of hospitalisation.
Did the CAV say what was wrong or what the 2 shots were for?