I spent a little more money on a set of wraparound powerheads with a controller just to have the metal encased internals that allow the external magnet to somehow hold it. I contacted the manufacturer and they said to send pictures of what I did and that was the last I heard from them. $165 for the waist. They are outside of Southern California, north of San Diego County. So I had to replace them and didn't want to throw money away and am pleasantly surprised with them so far. I have one in my tank right now and will be adding at least one more soon. Now they don't have the extra features I had, but they move water well.
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