the blemish isn't an issue with 8AWG
the problem is the 16AWg is a little to flimsy. and with the agitaor the parts tend to hit each in the tank. only one of the parts i do draws over 5 amps. but to use the smaller gauge i would have to still hook up my old way to to keep them still in the tank. so to avoid using 2 wire to hang a part i just use the heavier wire. with the bigger wire the blemish isn't to bad and in most cases very easy to hide. it leave a mark maybe twice the size the 16AWG leaves.
but it's all about what easier to use for the user.
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