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Did you apply the vinegar full strength or did you dilute it? Full strength vinegar should break down the calcification allowing it to at be removed with a bit of elbow grease. You could either brush it on full strength, or perhaps even better, if you have some old towels just hang those over the sides with the coralline and soak them in vinegar. You may need to pour the vinegar on, let it set, remove some of the coralline, and then repeat. If the coralline is thick, the vinegar may break down the surface a bit without getting underneath. But each time you repeat the step you should be able to get closer to getting it all. I used this method to clean a tub with bad deposits caused by a leak faucet. A couple jugs of vinegar is not that expensive. I wish you luck.
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