I saw this being done in someone elses pictures and thought wow thats the best idea yet. So I went to office max and got 2 things. A small box of black metal binder clips and a small box of split ring key tags. This works much better than dry erase markers which can be a pain when moving snakes around alot during breeding season. Its also easier than post-it notes since they lose the sticky after a few moves from tub to tub and you dont need to keep writing the info over & over. If you sell that snake just include the tag when you ship. For hatchlings I will still use dry erase and post-its since they are not with me for very long but this is a great idea for long term. Here are some pics. Just move the clip when you move the snake. Put 2 clips on the tub when there is a breeding pair. I wrote the year of birth on one side and on the other side I put the sex and morph type.