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Metal halides

Does anyone know the proper height (from top of tank or water) that a 
metal halide lamp needs to be?  Also, does it matter if you use a low 
bay or high bay fixture?  What kelvin temp is the best to use with live 
plants, and with corals?  Also, does anyone have any information as to 
culture for marine plant life (i.e. caulerpa, halimeda, 
pencillus dumetosus 'shaving brush'?  

Have we decided on what the best substrate is for live plants yet? Do 
you all use RO or distilled water or tap?  I have been keeping plants 
for over 10 years now, and no one seems to know.

Tom Prather

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