Lighting Height

[JW3571]

I have a 90g tank that is around 26 inches in height. I have 2 150 MH with 4 H5TO lighting. How far from the water should my lights be? I have them at 6 inches from the water but I'm having problem with some bleaching of SPS. Do i need to raise them?

 

[JW3571]

No one has an opinion on this?

 

[hollister]

6 inches sounds close but they could get used to this. The main thing is if u just upgraded your lights then u want to adjust your tank to them. Use them 1 or 2 hours a day a bring time used up slowly , about 2 weeks. This will help . Also 10 to 12 inches would help...

 

[kgross]

That should be a fine height, but if you don't acclimate the corals to the light you can get bleaching.