I know its a real pain to cycle but with a betta in an 8g the ammonia is not gonna shoot wildly up anyways.
Pair this with the fact that even if you save the filter media, if you're cleaning the rest of the tank out then whose to say that the bacteria won't starve before the betta produces ammonia for them to eat. It only takes bacteria a few hours to die off from lack of ammonia.
Thirdly, as a goldfish enthusiast I can confirm that goldfish are a very common carrier of internal and external parasites. The farms from which both fancy and feeder goldfish come from can be pretty negligent with their less valuable, pet-store quality stock and therefore its routine for informed goldfish keepers to rigorously quarantine new godlfish and deworm them, something I doubt this lady has done if she was uninformed enough to house two goldfish in a 8g tank.
Oh and as an afterthought I'm sure that if you asked in the general forum you would get lots of god ideas on how to keep BiOrbs clean without having to dump them out often.
Last edited by kelly528; 04-07-2010 at 11:37 AM.