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I haven't made any changes really tho for this very reasonI'll leave the chemical side of things to Randy, but I do have some questions. When you say the lamps 'blew' does that mean the lamps simply went out, or did they literally blow with the glass envelope cracking/disintegrating? Did any glass or lamp chemicals (scanadium, etc.) get into the aquarium? When you mention UV, DE lamps, especially those without intact glass envelopes and/or luminaire splash guards can produce some wicked UV wavelengths. Once, while on a trip, the outer glass envelope on a MH lamp exploded and naturally the UV dosage went way up. Some Acroporas I had were cooked (tissue missing) on the sides most exposed to the high UV. Hard to diagnose problems from afar, when *sometimes* a visual inspection would produce some leads. Making many changes at once makes it more difficult to ever know what happened.
By blew
The first light I was home when this happened I saw that the right side looked brighter then the left I was on the couch and it just "died" went out to never come back on
The second light was out when I got home from work
Third and fourth light were a high pitch humming I found out it was the lights as every time I touched the pendant the humming would go away. I shut the lights off and then the would not come back on.
I never had metal halides before so to me the lights seem to be normal?
No glass ever got in the aquarium and no bulb actually exploded I have a glass shield between the bulb and the aquarium



