Like I said, they are a lot cheaper from a vet. Also, everyone I have talked to didn't like the heavy duty ones because of the lack of sensitivity.

My best suggestion is to keep your hands out of the tank as much as possible. I have a pretty good selection of tank tongs and long forceps I try to use whenever possible. I also found some long, rigid 3/8" tubing that I am going to start use to siphon with when doing water changes. That's the one time I am in the tank the longest and now I have a solution for that. I heated the tubing with a cig lighter and put a very nice 45 degree bend in it so that I can get into caves and crannies to siphon. It will also hopefully prevent me from knocking off corals every time I get into the tank. I'll have better visibilty and dexterity with the tube when I am in front of the tank then when I am on a step ladder standing over the tank with my arm all the way to the bottom. The flexible tubing also has a tendency to move around in the tank and knock off recently mounted frags that have not yet encrusted. I hope this new system is better.