09-26-2011, 04:43 PM
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What is your plan with the 3 original fish? Obviously you learned that a goldfish has different requirements from a tropical fish (eveything else that you have). Male and female betta? They really shouldn't be kept together, the male will likely bully the female to death. It might not happen immediately, but it will probably happen. Bettas are solitary. Unless you've done a LOT of research on bettas I recommend a different gameplan (that includes 2 separate small tanks, 1 for each betta).
With a 36 gallon I'd get more cories though. 3 is more like a minimum number, not an ideal. If you can get at least 6 they will be happier. Look for more emeralds, as they will play with other species out of necessity, not because it's completely natural. But it's good that you saved him from his solitary petstore life. They are pretty active when they are comfortable, so I wouldn't worry too much. Cories tend to sit still on the bottom when they are scared or stressed.
Water parameters would be helpful, as well as more information about your tank or what your plan for the tank is (decor, live plants, heated, filtered, pH of water, etc).