I HAD 5 large fish (paku) now have 3 due to malfunction of this unit. It literally fried my fish. I spent hours changing the water and holding them upright over the aerators to keep them alive (my kids even helped). I managed to save 3 and slowly repair the damage thanks to a lot of Melafix. As much as I appreciate the heating elements myself for not breaking them, I will never use this type of regulator again.
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