MP-40s have that crazy undertow thing going on that I missed when I switched to Tunzes, plus the Tunzes take up a lot more room in the tank.
But... Tunzes are dead quiet, and they blast current all the way to the other end of my 4 ft tank. The MP-40 would only reach about 2/3 the way.
Tunzes are set and forget, MP-40s like to be tinkered with.
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