OohFeeshy
It's only forever; not long at all...
The fluncs generally very with how good the thermostat is, but I know when I had a heater in, one minute it was warm, the next very cold. Just not worth the hassle really, room temperature works fine 
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VIsitherm's are very good and though they can be a bit expensive in the shops, this is probably the best online deal at The Aquarium Shop - especially big value for money on the larger size heaters. Even with postage of £2.50 it's still a good price.kimsoph said:I am currently looking for a 25w heater,
I do already have a 3gal hexagonal tank
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