Bioballs and wet/dry systems in confuction with canisters are kinda reffered as "old ways" of doing things in a reef. These were the standard a few years ago, and some who started out with them, and are comfortable with these "tools" will swear by them. Hence a strong reaction to using them or not.
As the biology has been better understood, people have relized what is "really" going on with the bioballs/wet-dry/canisters and are getting away from them.
I currently see a trend of "less is more" with more natural filtration methods such as macro algae, and live rock only, supplemented with a filter sock to catch the large debris and polished with the skimmer. The same is tru with addivitves, that less is more and as clean, stable water that you can get with near salt water conditions is the best for "long term" success
We may even start to see other, more barren tanks with Bare-Bottom tanks getting heavily used in the SPS community, which could throw a loop into the DSB thought of tank stability.
We have to remember that this hobby is not set in stone and every day, week, month there are new discoveries that shake the very things we may "think" we understand.
On a side note, we need to take what others say as oponion, not gospel. Even mine for example!! I was in San Mateo a few weeks ago, and my friend was second guessing me and asking the LFS worker the same question. I nearly laughed when the guy said that the balls helped the ANaerobic bacteria breathe. Biology has been awhile, but I thougt anaerobic meant without air? Surely it was an honest mistake in nomenclature, but this guy is responsible for accurate and honest guidance. A mistake in aerobic versus anaerobic, makes me question if he knows what he is talking about in the first place or knows the difference between anerobic or aerobic bacteria. Examples of this are common, people tend to guess a little more than they understand. But do not admit that they are educated guesses rather than set in stone, which nothing here is.
A little off topic, but there but my point is that there are a lot of opinions out there that may all lead to the same place, make sure you double check someones "opinion" and form your own.
Sorry for the long post, I find some things are very debateable and one versus the other may not be "wrong", hence people still using them with success. For instance: this one or the t-5 versus MH debate on SPS. I'll get off my soapbox now, thanks.-Doug
P.S. I don't have bioballs..........the things are junk.:lolspin: