Answer:
In many hall ways you would stand if not with me in hand.
Part carbon part water I am poison to the fishes. Many falsely claim my name I am the pause that refreshes.
Island hello
I start new then become old. Start clean but become dirty. I usually start big then become little. What am I?
I can be long or short. I can be grown or bought. I can be painted or left bare. My tip can be round or square. (one word)
The strangest creature you'll ever find: Two eyes in front and many many more behind.