So lately I have been noticing something like spiderwebs inside my saltwater tank. I figured it couldn't be because how could a spider live inside water? Well thats when I saw it... a spider... The smallest little thing but he is definitly there. What is he and what does he do? I can only imagine there arn't many of these around. Does anyone know? I told my husband to kill it (I hate spiders) and he said no that its probably a good thing. Is it just me because spiders and good thing, do not belong in the same sentence!