Just like the topic says. The LFS is supposed to let me know if they can get in the Duplicareus for me. I'm guessing four would be appropriate? The tank will have small tetras in it.
I would get 5 of them. Odd numbers of fish always seem to work best and the 20 high has plenty of foot print for 5 cories (they get along so well with each other). Of course some cories do like to go to the surface and gulp air so I don't know how that will work. I have read that they like tanks shorter than 30 cm (1 ft or so). I only have a 10 gallon tank.
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