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Old 01-01-2005, 05:51 AM   #1 (permalink)
 
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I want to upgrade my 4x20 watt standard fluorescents to power compacts. AH Supply tells me that a single 1x55 watt kit will be sufficient. I was originally considering either 2x35w or 2x55w.

The tank is a standard 29 gal, planted with crypts, anubias, vals, bacopa, dwarf hygro, and ludwigia. DIY CO2. I'm not looking for monster growth or a foreground lawn, since this tank is in a classroom and is "casually" maintained. Will 1x55 watt be enough?

Happy New Year to all!
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Old 01-01-2005, 05:51 AM   #2 (permalink)
 
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I want to upgrade my 4x20 watt standard fluorescents to power compacts. AH Supply tells me that a single 1x55 watt kit will be sufficient. I was originally considering either 2x35w or 2x55w.

The tank is a standard 29 gal, planted with crypts, anubias, vals, bacopa, dwarf hygro, and ludwigia. DIY CO2. I'm not looking for monster growth or a foreground lawn, since this tank is in a classroom and is "casually" maintained. Will 1x55 watt be enough?

Happy New Year to all!
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Old 01-01-2005, 05:59 AM   #3 (permalink)
 
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Ask them about spread. Their reflectors tend to concentrate light under the reflectors. Others have suggested that you can widen the spread by bending their reflectors out a bit.

TW
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Old 01-01-2005, 06:20 AM   #4 (permalink)
 
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Great thought. My 4x20 array provides a fairly uniform light distribution, though it is not very efficient with respect to back reflection. I could also supplement the 1x55 pc with one or two ordinary fluorescents, if needed.
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Old 01-01-2005, 04:03 PM   #5 (permalink)
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If this was an "at home hardcore hobbyist's" aquarium, I would say go with the 2X55W PC set up. However, your description of a casually maintained classroom aquarium, with DIY CO2, the 1x55W PC from AH Supply would be a more prudent choice. Thise stem plants are going to struggle, but the low light plants will be fine.

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Old 01-02-2005, 02:43 AM   #6 (permalink)
 
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I'm looking for a little more than "struggling" from my stem plants. Actually, this tank in its current configuration has been a great source of stem cuttings for my other tanks. "Casually maintained" may not have been the most accurate description. It usually gets weekly water changes and regular pruning. It's a real eye popper for parents when they come to pick up their kids. "Occasionally neglected" might be a bit more accurate.

I'm wondering whether a 1x55 pc coupled with 2x20 no might be the way to go. Could even create a dawn/noon/dusk effect. Hmmm. The creative wheels are turning.
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Old 01-02-2005, 07:25 AM   #7 (permalink)
 
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with a 29 gallon I would be leary of a single 55 or 65W bulb. You may get enough light in the center of the tank, but the ends will definately not be getting enough light. The 21" bulb over a 30" tank just doesn't cut it, imho.
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Old 01-02-2005, 02:19 PM   #8 (permalink)
 
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If you look at my 36gal bow tank in the picture gallery, you can see what 2x55w cf from AH look like. There is not much difference in a 36bow and 29. I use pressure CO2 where you use DIY CO2 ether way a tank this size with 2x55w cf needs CO2. If you do not want to go this route you might look at 1X55 from All Glass. The reflectors on there fixtures spreads the light more even around the tank.

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Old 01-02-2005, 02:32 PM   #9 (permalink)
 
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I like the morning/noon effect. I get it in my 46g bf w/ a 55w and 96w cf. If you are reasonably happy with your current rate of growth, I'd go with a new 55w cf and keeping 2x20w. I think the kids would get a kick out of the varying levels of light.

Brian.
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