But as you can guess, I couldn't just leave the gold nugget to be bought by someone else (as happened with the other one that I had my eyes on)... So I went back... It's been in my tank for about 48 hours by now, and seems to be active, not just hiding in the same place all the time. I take that as a good sign...
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It looks like (from the "Catfish of the month" article about gold nuggets) that mine is a L177. Hard to be sure on that tho', as they tend to vary quite a bit in both pattern and colouration.
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Mats