I have some things that will help you describe your bags of fish and plants IN ADDITION TO the sticker Marc will give you when you register your stuff
when you bring your stuff to the auction Mark will print a little label with the item description and the lot number on it...
the ones I have here are similar to the french club in Montreal - they provide a place for you to write details like water chemistry, aggressivness, and any extra info you might want to add but dont feel like using a magic marker and writing it on the bag.
print them off on your printer and cut them out. and tape them to the bag under the lot number label.
you can download the file attached here.
they look like this
the plant one