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**To**:**Aquatic-Plants at actwin_com****Subject**:**Re: double fixtures****From**:**Dennis8425 at aol_com**- Date: Wed, 29 Jul 1998 22:48:33 EDT

In a message dated 98-07-29 20:36:48 EDT, Aquatic-Plants-Owner at actwin_com writes: << karen, for lighting, you suggested the 2 watts per gallon formula. that means that a double-40 watt fixture is not enough for a 55 gallon tank. where does one get a triple light fixture?>> Sorry I never saw a triple myself either. But I use a formula of gallons times 24 = watt hours. Therefore for the 55 gallon you need 1320 watt hours and dividing that by 80 watts you get 16.5 hours per day. This is only a rough number and needs to be adjusted down if you have effecient tubes like the chroma 50's or a few others. f<<or 10 and 20 (or 29) gallons, the only fixtures available are the single 15 and 20 watt ones, respectively. what are the other options? are there double fixtures for such tank sizes? >> I'm using doubles on my 29's and 30 gallon tanks. Thing is they use 20 watt tubes only so were back to the formula. But even with the formuula I find that running 14 to 16 hours a day seems to be almost ideal rather than the 18 hours from the formula. 18 hours just gives to much algea for my desire. Dennis

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