Oh yes, another simple idea would be use a metal coat hanger and make a hook. Sand the paint off J part where the nut will sit so it conducts electric, the painted part won't and will not plate either.
Connect all hangers to same lead wire and sit the nuts on the hooks, hang in tank. This should work well, but you need a hanger for each nut, compared to the bolt idea where you can screw 4 or 5 on each long bolt.
Course you could make 10 hangers quick and plate 3 times to get your 30.
Chromo
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