I need your help and knowledge, my cockatiel Loki has been leaving liquidy droppings for months, we still try to figure out what may cause this. We had been suspecting he might be sick but he is really active, eats, drinks, takes care of himself and sings. We also suspect that it might be a diet issue, we always bought him a bag including a variety of seeds but we are unsure if that's the issue. What can we do to help our parrot get better?