04-07-2010, 01:52 AM
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Do you have room for both? If it were me (I'm a newb) and I'd sorted out the issues with the 45 gallon, I'd want to leave my fish there where they are doing fine because moving them might stress them and cause new issues. (This might be a "newbish" and unfounded fear. Maybe cycling the new tank won't be a big drama because you've got your established filter to seed it from.)
If you've got room for both, you could set up the other one with sand for your cories, plant it up, then move them in after it's all set up and cycled and the plants are established. Even then, I'd still probably leave the cories where they are and get new cories for your bigger tank. Then again, you've successfully moved your cories before.....
In other words, I have nothing useful to say, but I appreciate your dilemma