I wouldn't send them to the lfs, grow them out in another bb tank.
Buy adults or near adults for your planted tank, it's much easier and more rewarding.
To tell you the truth, chances are your going to end up with smallish looking fish trying to grow them out in a planted tank. Most people imagine big beautiful discus swimming around in their tank, just do it the easy fool proof way from the start .
Adult discus can be expensive if money's a problem just save for a few months, you'll be happy you did.
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