water temp issues/questions - The Planted Tank Forum
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post #1 of 6 (permalink) Old 01-17-2006, 06:01 PM Thread Starter
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water temp issues/questions

Hi everyone - I have a 1.2 gal fish bowl that I am getting started as a planted nano. I have flourite and a couple of pieces of driftwood and a lamp with an 11w cf light. I am going to plant some HC as soon as I can get some and eventually have cherry shrimp with maybe a couple of male guppies. My house is a little old and drafty so I bought the hydor mini heater to put in the bottom. I hate the way that the cord looks sticking out of the bowl, but if I need it . . . then I need it. Here is the problem - with the heater (in case you don't know, this little heater does not have a thermostat) the temp ranges from 76-84 which is a little on the high side. Without the heater, the temp ranges from 65-75 which is kinda low. Am I better of with or without the heater for what I want?
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post #2 of 6 (permalink) Old 01-17-2006, 07:18 PM
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I would do without the heater, and pick fish that can easily tolerate that temperature range. There quite a few. White Cloud minnows are one, for example.

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post #3 of 6 (permalink) Old 01-17-2006, 07:37 PM Thread Starter
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Will shrimp do okay?
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post #4 of 6 (permalink) Old 01-17-2006, 09:03 PM
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I had rosy barbs in an unheated tank and they were looking BETTER than the ones in my 75 high tech setup (79 degrees). Their temps were probably between 68 and 75.

I'm of the opinion that a healthy fish can survive some temp swings of more than a few degrees. Up to maybe 5 or so over a few hours if they are healthy, well fed, not stressed out otherwise. At least I've never had a problem with some hearty fish in those setups (molly, platy, various barbs).
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post #5 of 6 (permalink) Old 01-17-2006, 09:32 PM
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Here's a good article on the basics of shrimp keeping:


The author suggests that the best range for shrimp is 70-80 degrees. I suspect that a gradual, overnight drop to 65 deg would not be too much stress for them, but you might want to continue to do some research on this issue.

Hope that helps,
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post #6 of 6 (permalink) Old 01-17-2006, 10:04 PM
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This winter I have kept a Hydor in my 2.5 all glass tank. Just as you have realized, the temp can flux quite a bit, certainly when combined with a plant light. I will definitely be removing this heater as we enter the warmer months. Your plants should be fine without the heater even in winter, and as the other posters mentioned, many of the more hardy fish should do well with the lower nighttime temperature also. In fact, I only heat mine becuase I have breeding killies in the tank.

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