Weird temperature increases

RyanScanner

Candiru
MFK Member
Apr 24, 2024
206
229
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39
Western Australia
I’ve got a 300g planted aquarium with a UV steriliser and 2x 500w dolphin heaters (brand new) I replaced the old ones.

I keep getting weird temperature increases from 25c to 28c. The room temperature is not above 25c during the day. I turned off the UV and replaced both heaters in case they were faulty. It’s still happening.

Ive got 3 thermometers 2x probe and a mercury one all within 0.6c. I’ve just turned 1 500w off See if that helps. Just can’t think why it’s happening.
It was stable for the past 10 months.
 
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