Lights lights lights!

[Blithespirit]

I read a lot about light colours (colors for non brits), types Of light but the real question that eludes me is height. I have two AI 32HD which currently sit about 10inch above my waterline, my tank is 55cm (sorry for change of imp to metric) from waterline to bottom with 2 inches of sand. I seem to be hurting corals using saxby settings from AI website. How do I know what strength of light to use at what depth. I do not want to hurt anything else with the wrong settings but what calcs should I be looking at, my softies are happy and zoas do not care but acros and Montipora complain and bleach. Any advice would be great please?

Thanks

Paul

 

[Doctorgori]

without a PAR meter its all guesswork IMO

 

[Snoopy 67]

Check the Bulk Reef Supply videos for that specific light. If it is there they give you all the information you need.
They are on youtube.com

 

[vetteguy53081]

10 -12" above water is an industry happy medium