No question is a dumb question! We are all here for a reason, and that is to act as each others really old grandfather who seems to know everything! LOL!
But a CPD stands for Celestial Pearl Danio. They are shy around larger fish like Coursair said, but as long as you don't go mixing them with enormous fish you should be fine!
You know you have a problem when you would rather hang out with a Betta than some of your relatives...
If you like my advice, or have a question about your betta(s), please message me or comment on my page!