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Old 11-01-2002, 04:56 PM   #1
micz
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I'm going to put 2x125 watt mercury lamp(Tarocal ) over my 65 gallon aquarium.
Is there any recommendation for:-
Height above water level ?
CO2 injection ?
Lightning duration?
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Old 11-01-2002, 05:38 PM   #2
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You want to keep them about 10"-12" above the water level and shield them with glass to prevent splashes.

Lighting photoperiod is subject to your nutrient levels and mostly based on algae growth. Start with 8-10 hours and step it up until you see significant algae growth and then back off. Plants do well with photoperiods of up to 12-14 hours, but not much more.

With that much light, you are going to need pressurized CO2 injection. If you don't have a pressurized CO2 system set up, there will be more light than the plants can use with the given CO2 levels and algae will proliferate. Get a regulator from a beer keg supplier for $40, then lease a CO2 tank from a welding supply store ($30-$40 a year) and plumb the co2 into a reactor, powerhead, etc.

Any particular reason you're going with the Mercury Vapor lamps? The color output is usually in the 3000K range (very yellow). With as much output as they will provide, the color isn't a problem for the plants - they'll still get all the light they need in the limited blue and red output the Merc lamp will provide, but algae will do better than the plants with the yellow light.
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Old 11-01-2002, 06:23 PM   #3
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Thank you very much for your quick reply.
I want to replace my fluorescent light to mercury, It's cheaper and more convenience to put 250 watts in this way.
Dennerle makes the Tarocal especially for aquarium.
Any idea of how may CO2 bubbles for minutes for the above conditions ?
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Old 11-01-2002, 08:00 PM   #4
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I would take a look at www.championlighting.com before getting that Mercury setup. They've got a retrofit 250watt metal Halide kit for $149 which includes the bulb. Can't beat that.

CO2 should be about 1 bubble per second, but monitor pH to be sure it remains constant, given the plant uptake for your bioload.
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