Originally Posted by MoneyMitch
I knew there was going to be a AC plug, wait till sang finds out :P
as far as best fitler im siding with jeff the sponge and sand will work perfect and easy to maintain.
Well, the beauty of the AC HOB design (or the mini canister) over a simple sponge filter is you could put in 3 AC sponges and have a HOB sponge filter and still have the flexibility to say periodically use activated carbon and/or other products like nitra-zorb, bio chem-zorb, phos-zorb, purigen, etc. - Much greater flexibility than a simple sponge filter and most other HOB designs on the market.
Oh and the AC20 is about $22. Perhaps twice as much as a sponge filter, but 10 times more flexible.
Now one could make the case that given sufficient volume and frequency of partial water changes and some (other) means of water circulation, any filtration is optional.
On the other hand, a good filter with the appropriate media components allows us to purify water beyond what even plants alone can do...and can (or should) reduce the required
frequency and/or volume of partial water changes.