I freely admit to purging my Python between drain and fill cycles, but not for any extended period. It is basically to be sure I do not have any Java Moss or snail shell fragments left caught in the hose before I fill my reservoirs. As the last thing through the hose prior to storage is chlorinated or chloriminated water, if you do a half-decent job of draining prior to storage, there should never be any pathogen or toxicity issues.
If anybody believes that their fish are the only bioload in their tank, they should try borrowing a kid's microscope and examining mulm, filter floss, bits of broken off plant foliage, etc. There is a massive and fascinating world operating in there - tanks are micro-ecologies, teeming with lifeforms.
If anybody believes that their fish are the only bioload in their tank, they should try borrowing a kid's microscope and examining mulm, filter floss, bits of broken off plant foliage, etc. There is a massive and fascinating world operating in there - tanks are micro-ecologies, teeming with lifeforms.