Hmmm.....I'm not an OFR, but I'll tell you my thoughts anyway
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if we've learned anything from the DSB "fad" (probably a little early to call it a fad) it's that long-term results can be unpredictable with any unexplored new equipment/filtration.
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I wouldn't call this a fad as much as a misrepresentation and misunderstanding on the hobbyists part (I'll insert my name here). Once people began to understand the functionality of a DSB (either by experience or through research), then we started to see people ditching the sand.
You can't argue with chemistry - it is what it is, and you can't argue with biochemistry. I just can't see how using an iron based phosphate sponge can be detrimental.
I feel that it is important to run one especially on an SPS tank, as the phosphates can inhibit growth. It is also important to run one on a bare bottom tank ---> no DSB to sink it....where is the excess going to go? Fuel algae. As far as softies go, IMO, they can get away with a "dirtier" tank in comparison to an SPS tank. Personally, I don't think that is becoming the latest "fad".....I feel more like hobbyists are beginning to realize and understand in depth what is happening in their systems. Phosphates are everywhere and are needed for survival....but we introduce so much. Food (homemade and prepared), salt mix, sand (saturated with it), calcium reactor media, the list could continue. When something dies in the tank....could be a little speck of algae....the organic phosphates, have now turned into inorganic phosphates, and will be taken up by other things and utilized. The trick is to get rid of it before you have an abundance in the system (unless you like the algae growing). This is why something like Rowaphos (as an example) is important.....why not limit the amount, so you don't get nuisance algae growth, and not limit coral growth?
Anyone have a chart comparing the different brands with their effectiveness?