I vote bubbles....
He just did a water change, and they're attached to his heater.
bubbles...
edit/ here's a thread I just looked up for reference. http://www.monsterfishkeepers.com/forums/showthread.php?t=207509&highlight=heater+bubbles
He just did a water change, and they're attached to his heater.
bubbles...
edit/ here's a thread I just looked up for reference. http://www.monsterfishkeepers.com/forums/showthread.php?t=207509&highlight=heater+bubbles
