omg, i had the biggest surprise just then. i just found my crayfish at the end of the hall way about five mins ago. he was about to crawl into my brothers room before i snatched him and put him back into the tank. he must have crawled out the little corner of the tank where there is a gap for wires. I've already blocked it up. I just thought ppl would like to know, i found it so shocking. the tanks in the lounge, so he travelled at least 30 feet away! lucky i needed a midnight snack, lol.