I just got my 6.6 gal 'bookshelf' tank from Petco (fits rather nicely at my desk) and thought maybe I could seed the filter from my little outside pond.
The pond (more like a puddle) is 30 gal with waterfall and pump, no fish, just whatever is calling it home these days. I pulled a piece of scrub pad from the filter and put it in the aquarium filter, and within an hour there were little red worms and other larvae swimming around, along with some primordial ooze.
Are there any 'bad' larvae, parasites or diseases that could harm a betta? I've used filter media from my koi pond to seed other tanks over the years, but never for a betta. Just thought I'd get some advice from the gang here before I do anything.