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Can anyone tell me what moderate lighting means. A lot of online fish sites say the corals require moderate lighting. I have a 216 Watt T5 fixture and think it is equivlant to around 300 Watts of a basic fixture. Is this moderate for a 75 gallon?
 

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Perfeshunal Hikk
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Low-Moderate-High ratings, in order to mean anything, would have to be related to PAR levels at the depth of water that you were keeping specimens at. What that means is that it is very possible to have all of those light levels in a given tank. What the lighting level would then dictate is the water depth you keep them at.
 

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If you have access to an Apogee PAR/Quantum meter, then you can measure the levels in terms of the PAR, moderate lighting will be somewhere between 50 to 80 micromole/m2/sec. Coral examples and PAR values after James Fatheree's unpublished work in the area for growing and established colonies without presence of specimen losses nor bleaching:

Specimen . . . . . . . . . . . . micromole/m2/sec (PAR)
Pachyseris Rugosa . . . . . . . . . . 110
Montipora capitata. . . . . . . . . . 110
M. spongodes. . . . . . . . . . . . . . 110
Pocillipora spp. . . . . . . . . . . . . . 107
M. unknown sp. . . . . . . . . . . . . 100
M. digitata. . . . . . . . . . . . . . . . 95
Acropora cervicornis . . . . . . . . . 80
Montastrea sp. . . . . . . . . . . . . 80
Acropora millipora . . . . . . . . . . . 79
Rhodactis sp. . . . . . . . . . . . . . . 79
Scolymia sp. . . . . . . . . . . . . . . 70
Zoanthis sp. . . . .. . . . . . . . . . . 65
Anthelia sp. . . . . . . . . . . . . . . . 65
Turbinaria paltata . . . . . . . . . . . 64
Pachyclavularia sp. . . . . . . . . . . 60
Turbinaria renenformis . . . . . . . . 58
Fungia sp. . . . . . . . . .. . . . . . . . 54
Euphyllia cristata . . . . . . . . . . . .52
Xenia sp. . . . . . . . . . . . . . . . . . 45
Trachyphyllia geoffroyi . . . . . . . . .40
Sinularia sp. . . . . . . . . . . . . . . . 32
Caulastrea furcata . . . . . . . . . . . 32
Actinodiscus sp. . . . . . . . . . . . . 25

As you can see some of these corals are in quite dim areas of the tank, some in shadows and gathering light and surviving with only reflected light.

Food for thought. These reedings were from colonies that were doing well, maybe not at their optimum light level, but growing and without any bleaching. Carals ARE quite adaptive.
 
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