"luminos" wrote in message
I have an uneasy feeling that by 'clean' you mean to tear down the
environment completely and clean it out. Cleaning is a bad idea, if that is
what is meant!

Should I ever scrub and fully clean the inside of the bowl? I'm now
aware of the weekly water changes but, in the case of a 2 gallon drum
bowl, when should I to do a complete water change?