I would go with the picasso. You might get away with the niger for a while if purchased small. I have owned 3 niger triggers including 1 i have now and they and they do not do much swimming.
The picasso is a slow grower. If purchased as a small juvenile it should be ok for a year or so. I do agree that the tank is too small for much longer than that. Seems like a good excuse to upgrade to me.
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