I usually never have my little pond freeze over, the bubbler keeps it open, maybe it’s going, every day I have to take warm water out and melt a hole. I dont want all the frogs to die over the winter.
Is your bubbler located at the bottom of the pond? If so, maybe you could use a pool noodle to raise it closer to the surface. That may or may not help. “Pond Breathers” work well, if you can get hold of one (Amazon carries them, as well as other online pet/pond sites). I’m sorry, but all I can suggest otherwise, is to keep doing what you are doing — your critters will certainly appreciate your efforts!
frogs routinely hibernate under iced-over ponds, so unless this condition lasts a long time, you don't need to worry about temporary ice overs. As noted, get a pond breather and you'll worry even less. You don't see 'frog-kills' like you do 'fish-kills' in spring....
If you have not already done so, tie a string to your air stone to keep it suspended up close to the surface of the water. It will better keep a hole in the ice that way.
You don't want it on the bottom during cold weather anyway. It will super cool the water where to fish are hibernating.
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