Nope. They make nice pets.
Water spiders will catch and eat any small fish they can catch but are you sure its a water spider and not just a normal spider that has decided to make a web in the nice warm hood of your tank.Of course its carnivorous, its a spiderWater spiders will catch and eat any small fish they can catch but are you sure its a water spider and not just a normal spider that has decided to make a web in the nice warm hood of your tank.
It looks like its just a common garden spider thats made its home in there, water spiders have a more elongate abdomen and longer legs.
, I'll Keep an eye on it. It Looks amazing zoooming around the surface of the tank. I'll try and get a vid of it tommorrow