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Zefiro, un'ultima replica, poi la finiamo qui perché sono esausto.
Il DSB ti fa correre più rischi rispetto ad un BB o SBB. Questo perché, sfortunatamente, non siamo tutti dei Ron Shimek o degli Eric Borneman. Facciamo una miriade di errori. Gli errori li paghi di più con un DSB che non con un BB. E questa, bada bene è una MIA OPINIONE PERSONALE.
Un esempio: Bonreman agli inizi sente dire che smuovendo il DSB puoi fornire ai coralli nutrimento sotto forma della cosiddetta reef snow. Come? Basta smuovere il fondo. Lo fa. Perde quasi tutti i suoi coralli. Eccoti il suo scritto:
Lesson Learned: The Middle Years
I had, by 1996, become a strong believer in deep sand beds. Having purchased live sand from the Marshall Islands at $6.99 per pound, and with the Tonga and Marshall Islands live rock in my tank having cost $12.99 per pound, my 120 gallon reef tank represented quite an investment in substrate alone. I was using three 175-watt 10,000K bulbs supplemented with actinics, a homemade skimmer that was six feet tall and utilizing a 1.5-inch Mazzei venturi injector. I was also using a surge tank for water flow based on the Carlson device that had just appeared in SeaScope (Carlson 1996). The house I was renting at the time had a constant crust of salt from the surge spray all around the tank and even the electrical outlets. I also had a pure Jaubert system as a 40-gallon breeder tank that had been in operation for two years at this point. Some aquarists had been suggesting that it might be a good idea to stir sand beds and release the accumulated detritus for removal by skimmers and to provide particulate foods for the corals. Already long considering the lack of particulates in the water column and ways to provide them, but not having given much thought to sedimentary microbiology or changes to water chemistry by stirring these sediments, it sounded like a good idea. So I stirred my sand beds a few times over a period of a week. Initially, I was impressed as the coral polyps opened and fed on the material that clouded the water column. A week later, most of my Acroporids began sloughing tissue, and I had my first really serious bout with what was then called "rapid tissue necrosis." It wiped out most of my corals, and it spawned my interest in what would eventually become one of the major subjects of the dissertation that I am now in the process of completing.
Lesson Learned: Sand beds are great, but are best left alone. They harbor huge populations of microbes, many of which are opportunistically, indirectly, or directly pathogenic to aquarium inhabitants (and humans). The changes in redox that occur in sand beds, along with disruption of anoxic pockets that may contain hydrogen sulfide, wreak havoc on all manner of water column parameters and can result in the death of virtually every fish and invertebrate in the tank. They are not nutrient bombs, but do need to be understood for proper function in an aquarium.
Questo non significa che lui non lo utilizzi più, ma solo che ha imparato una lezione.
Io mi chiedo, perché correre il rischio quando i benefici non portano a un risultato di gran lunga migliore di quello che posso ottenere senza un DSB? e quindi potrei girarti la domanda e chiederti quali sono i benefici REALI che un DSB apporta (nella vasca del tuo esempio andrebbe benissimo)?
E' chiaro adesso il concetto? Gli americani direbbero Keep it simple!!
Mat
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Mat
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