Is it me or the heater? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 23 Old 02-01-2009, 10:52 AM Thread Starter
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Is it me or the heater?


I have a 20g tank, and I am using a Hydar 100w heater. I have it set to the maximum setting, 87F, but I have seldom seen the tank over 75. This is the very bottom of the tolerable range of temperature for my tetras. This become a big problem when I do water changes and the temperature drops below 70 and often stays there for almost 24 hours. This seems like it would be very stressful for my fish. Is it something I'm doing wrong, or is the heater just being unreliable, and if so, which brands of heaters have you guys found to be consistent?



EDIT: The tank is also near a window, so that might be the problem, I guess.

Last edited by meatball; 02-01-2009 at 10:54 AM. Reason: Remembered the window part
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post #2 of 23 Old 02-01-2009, 10:52 AM
sounds like you need a bigger heater
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post #3 of 23 Old 02-01-2009, 11:07 AM Thread Starter
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That makes sense - one more quick question, though. If I get a heater that could potentially be "too much" wattage for the tank, it will not overheat the tank or anything, will it?
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post #4 of 23 Old 02-01-2009, 11:12 AM
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I've got two of these on a 100gl:

Visi-Therm Deluxe 300W 13 1/2"Heater

One is set at 78, the other at 82, which keeps my tank at 78 degrees.

I've got another 25W in a 6gl set at 87 to maintain the tank at 80 degrees.
I agree that you'll need a higher wattage of heater to get your tank up to 78 degrees.

If you don't stand up for something you'll fall for anything...
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post #5 of 23 Old 02-01-2009, 11:23 AM Thread Starter
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Ok - I'll probably get a 150w next time I go to the store.
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post #6 of 23 Old 02-01-2009, 11:28 AM
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I am thinking you may have a faulty heater. 100w should be able to heat your tank. When buying a new one it is always better to go with more watts, then the heater is not working as hard to heat the tank. You may just have to turn down the heat setting to get your tank at the desired temperature.
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post #7 of 23 Old 02-01-2009, 11:36 AM Thread Starter
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Yeah, the heater's always been pretty unreliable, so I think I'll get a 150w to get rid of the problem for sure.
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post #8 of 23 Old 02-01-2009, 11:55 AM
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also when you do a water change you should put the water in at the same temp as whats already in the tank. so if the tank water is at 75, the fresh water should be at 75 also or at least real close.

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post #9 of 23 Old 02-01-2009, 12:17 PM Thread Starter
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I've been wondering about that lately too. Do you just use the hot water from your tap? If that's what you do, do you gt any problems with mineral buildup in your water heater changing the water quality?
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post #10 of 23 Old 02-01-2009, 12:35 PM
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It does not seem to effect my water quality. Its not a bad idea to just let the water run for a minute before using it, to kind of flush it out.
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