01-24-2009, 01:30 PM
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In a 10 gallon, the Columbians are probably feeling a little crowded and taking it out on each other. The solution is a bigger tank, and preferably another 3 corys and 4 tetras. So a 20 high would work, a 20 long better, and a 29 or 30 better still. If a bigger tank is not an option, then smaller tetras - glowlights, neons, embers, black neons, flames, lemons - something that will stay 2" or less and isn't super active (Paraguay white tips, dawn tetras, gold tetras, rummies, bloodfins: these all meet the size requirement, but really ought to have at least 30" of swimming space.)
On the cories, they would probably be happier in a group of 5 or more.