Yes. Any poly is really a good starter poly because they aren't that hard to keep. A 40b is a little small as sens get up to 10 inch. A palmas would grow a little slower and I've even had some max out under 8"
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sens generally are smaller because most palmas are still wild caught.
sorry not to change the subject but has anyone had any problems keeping multiple senegals togethter in the same tank? aggression wise?