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Imo a goldnugget pleco that size is pretty much done growing. As long as he's not being crowded with overstocking and has nothing else of that size to compete with it should be fine in a 75gal.
That should be fine. Sounds like your on the fence about the pleco. I think it will do fine in a 75gal. with a modest stocking of a couple angels and school of tetras.
Hope it works out for you. Goodluck and keep me updated. Goldnuggets are my fav pleco.