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Da alcuni studi che trovate discussi su Reef Central pare che l'abbassamento in acquario del flusso delle pompe porti a diversi problemi

Da Reef Central

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Because when the lights go out there is heavy respiration by all the animals and plants in the tank, but there is no photosynthesis to replenish the oxygen consumed. Oxygen levels, even in nature, drop dramatically and the water near the reef surface becomes hypoxic at night. Water motion helps to bring in oxygenated water and is especially important for animals like corals that rely on diffusion of O2 from the water column. There’s actually a thin layer of water that “sticks” to the surface of the corals and becomes especially low in O2 as compared to the overlying water. This boundary layer forms a barrier to diffusion of O2 in and CO2 out of the coral, essentially suffocating it. The faster the water flow, the thinner the boundary layer. It doesn’t make sense to increase the boundary layer when O2 is already at it’s most limiting.Essentially none of our animals actually sleep and those that enter some state or torpor don’t need lower flow to do so.

ed anche

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I’ll also point out that in the shallows that get a lot of circulation from wind-driven waves which may indeed calm down at night (but not as a rule by any means) the waterflow is typically much stronger than what is in anybody’s tank. The surge from even modest wave action at a few meters depth is so much stonger than what is in anybody’s tank. You can kick like crazy to maintain your position and it doesn’t matter–you still get tossed back and forth. I’ve yet to see any aquarium that had waterflow so strong that I could not swim against it.

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