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| Lighting, Filtration and Other Equipment This is an area for discussions about lighing,skimmers,filtration systems,RO units,Protein Skimmers and other equiptment. |
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#1
06-19-2012, 11:33 AM
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 How High?
I have a shallow frag tank 4" x 4" x 12" lit by a 400 watt. I have tones of zoas, Digi, Monticaps, birdsnest, favias, chalices, acans and various palys.The light was about 24" off the water nows its about 30" some of my red montis turned pink when the light was 24" above water level. i dropped them down and raised the light and there red color is returning. heres the prob. most of my zoas and palys came from a crashed tank and where closed and on overgrown plugs. 30 days ago i introduced then to my tank. waited one week until all the frags were fully open then cut all of them in to smaller frags to allow room for new growth. now today all of them look very well, Not that colorfull yet but they were pretty rough when i got em. some of my palys and zoas are reaching for light like crazy? like 1" long stems?? There not growing and some are coloring so slowly. So... Im thinking about lowering my light back down? how high should it be? PH 8.2, Alk 12, Calcium 420ppm, Phos .5, Nitrate 0, Sal 1.024.         |
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#2
06-19-2012, 11:34 AM
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the light is about 10" higher then in the last Pic BTW
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#3
06-19-2012, 07:06 PM
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man i wish i had a par meter
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#4
06-19-2012, 07:48 PM
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400 watt which bulb? You might find some simple par numbers using google?  The tub is 12" deep, is the egg crate right on the bottom or suspended? |
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#5
06-20-2012, 03:18 PM
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20,000k Radium. Its 10" of water. 1" for the elevated rack and 1" for the rim so id say i have 10" of water. I moved the hood down lastnight 26" from water to center of the bulb. hopefully i dont get out of work and all my frags are white.
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#6
06-20-2012, 03:37 PM
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#7
06-20-2012, 03:41 PM
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sorry typo. 1.024 lol
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#8
06-20-2012, 07:45 PM
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You didn't mention a ballast - that bulb will produce wildly different values depending on ballast.
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#9
06-21-2012, 12:24 PM
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its a galaxy magnetic ballast
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#10
06-21-2012, 04:38 PM
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Typically, a metal halide pendant is good for a 24" to 30" square. You will find that as you lower it you will reduce the coverage. If you raise it then you will reduce the par values reaching your corals. I would recommend another pendant or a rail system that will move the pendant back and forth. I have seen these in use in large operations. It helps to reduce heat and cost of operation. This will still give your corals tons of light but it will travel the length of the tank and cover all of your corals. Good luck.
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| Tags |
| 400 watt, ballast, birdsnest, calcium, color, crazy, egg, frag, frags, galaxy, growth, halide, hood, light, mag, nitrate, palys, par, rack, red, tank, water, watt, zoas |
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