I have been using my Fluval 206 for almost a year now without the nitrate jump everyone keeps talking about. I have tested my water and it keeps saying 0 along with everything else but my PH which is at 8.
So whats the deal? It keeps my water really clear and clean and not one issue everyone has warned about. It continues to run as if it was brand new out of the box. Of course I do clean this filter out once every two to three weeks. I clean the whole thing out and I replace the Polly filter I buy and the carbon. I Squeeze out the sponges in dirty tank water to keep the Bactria on them.
I have read many articles on the use of bio-balls and canister filters. I have come to the conclusion that most people don't clean them out at all or as often as they should. This leads to the build up of the organic matter that causes the spike in nitrates.
Of course everyone is on the same page when it comes to a reef tank, that using bio-balls and a canister filter is no good, but for a FOWLR
tank the use of the wet-dry filter with bio-balls and a canister filter should be fine so long as you are willing to do the work and clean them when necessary.
So why do people so passionately say no to the bio-balls and the canister, When they are proven to provide great filtration and benefits if used properly? I for one believe that so long as you only plan on doing a FOWLR
tank you should be fine going with any method you choose for filtration.