01-09-2007, 05:49 PM
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Actually, I was referring to rainbow fish, but it's important to know WHICH rainbow fish.. some would do fine in your tank, others would not. As for plants, most of the larger rainbow fishes tend to chew on plants.
In regard to the rainbow shark, I wouldn't mix that with the bala. 1 shark species per tank, safer to work only with 1 shark per tank. If your bala needs to be seperated, I would consider putting him into the new tank and waiting to add a rainbow shark until AFTER the bala outgrows this new tank. Average length for a bala shark is 14 inches, so yes, it will still outgrow a 4 ft tank at some point.
Knowing that the bala is the main resident in the new tank, I would avoid the giant danios with him. They are aggressive compared to other danios, and the stress of their constant chasing would likely make the bala sick.
The habits of the rainbow shark are about the same as the red tailed shark, so all of the warnings we've already given about the red tail apply to the rainbow shark... they average 6 - 8 inches and are aggressive, territorial, and need plenty of hiding places down low. They tend to eat smaller fish, especially during the night/dark hours. They are more nocturnal of an animal, and even larger fish, if not aggressive enough to hold their own, will tend to get chewed up by the sharks.