I havent read anything of R. Shimek's on DSBs recently but to me he lost alot of his credibility when the problems with them surfaced on a large scale. Much of his info on DSBs was personal opinion, not based on experimental evidence (a big no-no in the scientific community).
Like Chin-Lee said about bioload ratios as compared to the ocean. A DSB may be viable in a 100 gallon tank with a single 1" fish but who is going to stock it that way?
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