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Old 12-17-2004, 09:14 PM   #1
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Glass canopy with MH?

I have a tank where a 150W MH sits on legs 7" above the tank. I am concerned about having an open top, so I use a glass canopy to cover the tank. The temp stays about the same so there are no prbs here, but I was wondering if anybody knows if the glass cuts out a lot of light or not. I cant tell the difference with it on or off, but maybe its something the human eye cant see

thanks, Brian
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Old 12-18-2004, 10:58 AM   #2
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Yes, you will loose some light penetration with the glass top and salt creep that builds up on it. Why not go topless? It allows for better gas exchange and better light penetration. Downside...you do loose more water to evaporation. But that is not a bad thing for your tank.
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Old 12-18-2004, 12:56 PM   #3
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You could put eggcrate on the top. You PH would benefit from an open top as well.
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Old 12-18-2004, 02:36 PM   #4
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I've heard of mh melting eggcrate
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Old 12-18-2004, 03:19 PM   #5
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hmm, maybe if it was too close to the lights. I have plastic moonlight 4-5" from my MH's and all is ok. I keep my MH's about 8-10" off the water.
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*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,
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Old 12-18-2004, 04:35 PM   #6
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Here's why I'm a little skeptical about an open top. I live in a college dorm, with a bunch of idiots. With my luck something would find its way into the tank. Wouldnt the egg crate block out just as much light since it is a light diffuser?
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Old 12-18-2004, 04:40 PM   #7
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Probably. Would be better for gas exchange though.
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*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,
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Old 12-18-2004, 05:25 PM   #8
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I guess I'll just use eggcrate, since I already have some for light acclimation, and use the glass canopy for when I go out of town or something.

Thanks again, Brian
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