matt23983 wrote:

Does all biofiltration have to be wet/dry as in the bio-wheel?

No, not at all. Wet/dry systems are a highly efficient form of
bio-filtration because they allow lots of oxygen to reach the bacteria
that are doing the work, but they're not the only method. An
undergravel filter, for example, provides good biological filtration,
and in fact every surface in your tank eventually will have bacteria
on it.

Would it be feasable for me to get a couple of bio-balls and drop them
into my Aqua-Tech 5-15 filter, would that work or do the bio-balls need
to be wet/dry?

That would work - the bio-balls simply provide a large amount of
surface area for the bacteria to develop on. Keep water flowing over
them and they'll do a fine job once the system is established.


--
www.ericschreiber.com