I worry that I'm either feeding my sweet parakeets too much or not enough. There are 2 birds and I've been giving them 3 tablespoons seed, 1 tablespoon fruit and veggie seed mix, chopped carrots and apples. I never can tell how much seed they've eaten but they always eat the carrots and apples. Should I use two seed cups? They are so cute, one will eat for a little bit then that one hops down and the other one will eat. They continue this for several minutes. So sweet. Also what seed is best. They seem to leave the colored seeds so maybe they don't like them. I would appreciate advice. Thanks.