I just took and uploaded some pictures of my tank. You can kind of see that the peacock fern's leaves, or whatever ferns have, are starting to curl from being under water. But the fish are darting around them so much I am loathe to take them out. Assuming that the LFS will not refund my money and will only let me exchange, what should I look for to replace them? I want something big and tall, and something that is fairly hardy. And I suppose it should be common, because the store has a lot of plants, but I am in no way able to differentiate between species.