ah, too bad im not done with my Clown Loach FAQ hehehe. i thought Neon-blu beat me to writting one when i first saw the topic
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yes, your tanks are way too small to keep clowns(or even A clown) and a 40 gal wont let you keep a clown to full size
. clowns are also a tricky fish to take care of, and should be kept in as large a group as possible. they can go with all kinds of fish, but rather be kept with other schooling fish(tiger barbs work great!)