Putting your hands in the tank with open wounds to my knowledge will not harm your fish, what I am talking about is the fish bacteria(Mycobacterium marinum) this can be transfered to humans through open cuts. If you are unfortunate enough to be inflicted by this bacteria, the time taken to heal can take 6 mounths or more and also can result in surgery. The areas affected are usually hands, knees and elbows , if you want to know more about this just do a google Mycobacterium marinum, there should be plenty of information on it. Like I said before the aquarium is not the only place you can contract it(lakes , swimming pools ect), but if your fish have this bacteria you are much more likely to be infected especialy if you have open wounds and definately do not put your hands in your tank until things are rectified. People who siphon with their mouth are in the same boat, but the way I understand it is that fresh open wounds is the most likely way to be affected(But siphoning with your is still a risk) . But like I said before dont panic if your immune system is fuctioning well your are more than likely to be fine.
uke:
works everytime and its simple
