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Old 10-05-2004, 10:03 AM   #1
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Tank heater problem

I have a 20 gal FW with a new 75 watt Top Fin heater. I am concerned that maybe I don't have enough wattage. I want to keep my tank at 78 due to having a tropical angel in the tank. I have adjusted the heater to where by the end of the day, it will acheive about 78.5 per my digital thermometer. However, when I turn the light off at night, and it loses that source of heat, the tank is 76 the next morning. Is this a problem??

Rob
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Old 10-05-2004, 10:16 AM   #2
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Not a huge problem, but probably not ideal either. 75 watts on a 20 is really borderline. Jeff
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Old 10-05-2004, 10:18 AM   #3
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Jeff, what would you recommend for a 20 gal tank?
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20 gal FW
3 jumbo neon tetras
3 bloodfin tetras
3 otos....1 with only 1 EYE
1 long finned red serpae tetra
1 chinese algae eater
1 male blond tux guppy
1 male red neon guppy
...and 10 guppy fry!!!!!
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Old 10-05-2004, 10:25 AM   #4
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I'd be tempted to put another 75 in the opposite corner. That way, if one failed and stopped heating, the other would keep your temperature up to 76/78. And in a worst case scenario, if one of them stuck on, the other one just wouldn't come on and you wouldn't fry your fish. I use two filters on my tanks for the same reasons. Jeff
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Old 10-05-2004, 10:32 AM   #5
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That is inadaquate heating for a 20g Mofo. Rule of thumb is 5 watts per gallon. I like 2 heaters in a tank as well. I'd purchase a 50 watt heater and allow them to work in tandem.
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Old 10-05-2004, 10:38 AM   #6
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I think I will just take back the 75 and get a 100. They told me at the lfs that 75 would be OK. Does anybody recommend a target temperature other than 78?
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Old 10-05-2004, 11:46 AM   #7
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78 is fine for those fish, and I would also recommend getting two smaller heaters rather than one large one. You could just get another 75 or a 50w and put it in the opposite corner.
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Old 10-05-2004, 12:04 PM   #8
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I will have to see if I have room to fit another heater. However, I am getting what I believe is a consensus that 2 heaters will do two things better: 1.) hold temperature better, and 2.) provide redundant protection if one heater fails. Also, I think I understand that my problem at night (not being able to hold 78) is due to my single heater being too small. In other words, if I were to add wattage in one way or another, I should be able to hold 78 at night.

Rob
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Old 10-05-2004, 11:45 PM   #9
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Right - your heater(s) should be able to maintain your tank at a constant temp day or night, summer or winter.
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Old 10-06-2004, 12:04 AM   #10
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unless it gets to hot outside... i have a ebo jager 150 in my 29 gallon. it rarely goes under or over. every so often i see it at 82 but never more . i also have tetra whispers which like arent the best but they keep the temp around 74-80
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