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  1. Betta Fish Bowls, Habitats, and Accessories
    I just bought the Hydor Theo heater and I’m having trouble deciding where to place it🤔 I’m in between two spots right now, in the back corner kind of by the filter outflow (where it is located in the photos below) and in the center of the back of the tank where his old heater was, right next to...
  2. Betta Fish Bowls, Habitats, and Accessories
    Hi again, everyone! I've been gone for a while but I'm back and looking for help on some heater issues I'm having. In January, I got a male betta and kept him in a 1 gallon tank with a Hydor Theo 25W adjustable heater. Since then I've been able to move him into a 2.5 gallon tank (which he was...
  3. Betta Fish Bowls, Habitats, and Accessories
    Hey everyone! So I finally got my Hydor Theo 25 watt heater for my 2.5 filtered tank. It's been keeping the tank at 80 degrees (even though I have to set it for like 76). And I just noticed this white inside the heater. Are these bubbles? Is it cracked/broken? Should it be removed?
  4. Betta Fish Bowls, Habitats, and Accessories
    Hi, I've had a 25 W Hydor Theo heater for almost a year now and it has always worked fine. The past few days, however, there's been some problems. It's always done a good job keeping my water around 80 F but two nights ago I noticed the water was around 86 F. I turned the setting down a couple...
1-4 of 4 Results