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If your system based on Indonesian Ocean biotopes, the low would be 78F and the High at 84F. Check out Tomas Tomsick, Ecology of the Indonesean Seas. Amazingly enough, in an area of the world where there are many tectonic and volcanic influences, the ecology of the Indonesian archipelago, especially in the eastern end of the Banda, Flores and Molucca Seas, is relatively benign in terms of both temperature and salinity swings. This is not to say that there are not any such swings, rather, that they occur in a relatively narrow band (compared to the rest of the ocean), especially considering the strong seasonal upwelling that occurs in this reagon. When compared to the Great Barrier Reef or the Caribbean, the temps in the Indonesian Seans are in a very narrow band, and do not have the severe disruptions that are experienced in the GBR or the Caribbean due to cyclones/hurricanes or low temps (most coral reefs in the Indonesian Archipelago are in protected bays).
Of course, this flies in the face of the Intermediate Disturbance Hypothesis, where biodiversity of an environment is attributed to occasional disruptions of the biotope to engage the organisms of that environment in new ecological nitches (Indonesian seas exhibit the largest number and diversity of spp. of any of the coral biotopes). Our corals will survive drops outside this range, especially an occasional one lower, but higher than 84F or 85 F (29.5 C) is a prelude to bleaching events.
Sorry, got off track...
78F (25.5C) to 84F (29.5C), I routinely keep my tanks at 83 to 83.5F
(where is the d@^^n degree key???)
__________________
Tom <"))))>(
(TDWyatt)
Wise men speak because they have something to say; fools, because they have to say something. -Plato
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