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Reefer420

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Location
Manhattan
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For a 20 g you probably don't need one (with an ice probe anyway)- I don't have one for my 16. 20g is pushing it for the ice probe to do more than slowly keep the temp 1-3 degrees cooler. It will probably take a full day for it to have a noticable effect.

I just have my heater set at 76- if the tank drops it comes on and more than compensates for the ice probe. Probably uses more electricity though...
 

Reefer420

Advanced Reefer
Location
Manhattan
Rating - 100%
15   0   0
well the heater kicks on if the tank temp ever goes below 76...even w/ the ice probe the heater has no problem bringing the temp up again- the ice probe really isn't all that strong of a chiller and won't bring down the temp more than a few degrees in anything larger than 15g...nothing a heater couldn't keep in check- and in the summer it rarely gets down to 76 in my tank anyway, with the chiller on. So the tank temp stays stable :)

due to the fact that the ice probe really takes hours and hours to make a noticable differance in a larger tank, a controller turning it on and off won't allow to it actually do its job as well ans it can without one imho...
 

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