Thankyou both for replying.
@paulie, the vet prescribed some meds (cant remember the name) to help with his diarrhea and I gave that to him everyday for a week. And it wasn't so much head bobbing, I guess its more similiar to when they regurgitate food, that sort of action, but not quite if that makes any sense.
@Finnie, His stools are completely normal from the looks of it, well formed, not too watery, not sticky, and he's very active, alert and I see him eat both his seeds and his vegies, he takes naps throughout the day but doesn't sleep often. and he only fluffs up when he's tired and about to take a nap. The thing is though, aside from his pale yellow vent and his weird behaviour he seems like a completely healthy bird. Ah, the reason why I ask about the vet is because I'm a uni student with little money and the avian vet will cost me almost $200 where the regular vet I saw only costs me $50.
Both birds seem to really enjoy the vegies and they go through one leaf a day (is that normal?) neither are very willing to try fruit yet, but I do place some in the cage everyday.
Also, little skye has a bit of a tail bobbing, is that okay?