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IR is "line-of-sight" but it is a light signal being sent. Light can be reflected.
Most TV remotes work on exactly to same principle.
Take your TV remote and point it at the ceiling, it will likely still work, and may even work if you point it at the opposite wall (If it is powerful enough, like many 4-cell programable remotes).
This works best if you are in a room with light colored or white walls, and also a dimly lir room may help minized interferance.
I can't get you any specifics about the tanks since I don't have one (which is REALLY too bad), but should be the same thing.
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