Bit of a dumb question, but I am new to keeping fish and already know soap is bad for fish, right now i have just plants in my tank, and I do wash my hands with antibacterial soap after using the toilet etc. but always rinse thoroughly with cold water before putting my hands in the tank. Though still worried I may have got soap in there, because theres no fish I can't tell if there is/isn't soap in my tank :L Are plants effected by soap or just fish? Also do you guys buy a special organic soap so you dont have to worry?