When Dalai came to us, he brought his own seed in case he did not like ours.
His seed looks different to ours; the over all colouring looks more yellow, though we can see lots of similar seeds. Over time, I have gradually added more of our seed to his non-specific seed mix, so that by the time we have run out of non-specific seed, he will be happy to eat our seed.
Although it is normal for seed mixes to have some shell in them, I was surprised to see these tiny, perfectly proportioned shells in the non-specific seed mix:
Three tiny shells
Tiny shell with end of wooden coffee stirrer