There are plenty of dither fish you can put in that tank for movement. Hatchets being one. Most dither fish are pretty easily kept.. You may lose one or two to the catfish eventually. I sexes them by their dorsal fin. Planet catfish has some good info on there. Check them out
http://www.planetcatfish.com/shanesworld/shanesworld.php?article_id=378
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+1
I also sexes them by fin rays. The males leading dorsal fin ray is noticeably longer. Also my females are 3 times bigger than the males. Coincidently only buying females now, my big girl pushing 7-8".
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