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Old 01-07-2005, 02:48 PM   #1
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Ever heard of this happening?

OK I got a new 175w MH w/ (2) 65w PC actinics recently I put it above my 92 corner tank on blocks lifting it about 4 inches off the glass surface, well after 2 days imagine my surprise to come home and find my glass caopy lid broken and sitting at the bottom of my tank, thank goodness the light didnt deep six as well it stayed out of the tank luckily. So anyone ever heard of that before?
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Old 01-07-2005, 02:58 PM   #2
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See my post about my new glass tops. Happened to me a month or so ago.....but I didn't have them raised at all. Now I do...but not 4" so now you got me all worried that it will happen again. Do you have a canopy over the lights as well? and how thick were your tops?
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Old 01-07-2005, 03:03 PM   #3
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Are these MH hoods? I thought they were meant to sit right on top of the tank. Can they not be over glass at all?
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Old 01-07-2005, 03:03 PM   #4
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*gasp*

Every coral tank at the LFS's always have their tank with the lids off and the $800-1000 metal halides hanging from the ceiling about 6-12" from the surface.
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Old 01-07-2005, 03:11 PM   #5
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OK I just did some measuring and as usual my guesstimates suck...sorry guys...lol...OK heres the deal light was 2 inches off the glass and glass tops were 1/4 inch thick. Also I have no canopy over the top of the lights completely open. Hope that clarifies some
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Old 01-07-2005, 03:15 PM   #6
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I am going to Home Depot today to get some chain and some butterfly anchors and gonna hang this hood from the ceiling about 8 inches off the surface, was gonna do this over the weekend anyway thought I could get away with the temp solution on blocks till then, LOL, guess not. Also I ordered a new glass top for the tank, I know the LFS have an open top and it has been suggested a few times but I have quite the escape artist in a 2 foot Snowflake Eel and I dont really want to feed my cats fresh seafood yet
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Old 01-07-2005, 03:31 PM   #7
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MH gets extremely hot. 2 inches off the glass is definitely not enough. I have a friend that had an MH a few inches off the glass and melted his center brace on the tank. Needless to say, he had to get the brace replaced. I have mine positioned about 12" above the water. TO accomplish this, I had to build a 15" custom canopy that would house the retro's and 5 inch fans on each side to keep the temp stable. Although these lights are spectacular, they can be very dangerous. I'm just glad your tank is fine.

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Old 01-07-2005, 04:04 PM   #8
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I am running PC's....so how far off the 1/4" glass should I have those with a canopy....obviously the canopy is going to limit it
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Old 01-07-2005, 04:07 PM   #9
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I run PC's in addition to MH. The PC lighting doesn't get near as hot as the MH. I was running then about 3-4" off the glass tops before I built the new canopy.

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Old 01-07-2005, 04:30 PM   #10
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so 2-3" should be kosher even with a hood you think. I only run them 5 hours tops a day. I have an artificial reef cause my selection of fish involves teeth and stuff
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