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**To**:**"'Aquatic-Plants at actwin_com'" <Aquatic-Plants at actwin_com>****Subject**:**RE: Aquatic Plants Digest V3 #417****From**:**"Chandrasekhar, Praveen" <pc18949 at glaxowellcome_com>**- Date: Thu, 30 Jul 1998 13:03:16 -0400

>> Subject: Re: double fixtures >> 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 I use two double light fixtures that gives me 80watts over the 29 which works out to be ~3 watts to a gallon. These lights are run on a 12 hr period and have had no problem with algae. You can get these double light fixtures from Home Depot. Then make yourself a DIY hood to accommodate both the fixtures and you should be set. Good luck Praveen Chandrasekhar

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