Good question....in our tanks we are trying to setup a bacteria friendly environment...ie..the bacteria that eats the ammonia, nitrite, and other benificial bacteria for our fishies....the antibacterial soap kills those bacteria, can kill our corals and our fish. We know a gentleman that failed to clean under his nails before entering his tank and he killed everything...scraped under his nails and collected almost a gram of built up soap scum from antibacterial soap..
We found the best thing to use is ivory bar soap..unscented...just raw ivory its 99 44/100% pure soap...wont hurt anything in the tank...
Lee & Linda