Do you see the wave at the surface? I do with mine but the back and forth action you normally see lower in the tank is different. Not really an obvious thing but if you watch particulates in the water you can tell they're moving more erratically. I think you should keep them too. Should at least see a wave on the surface though I'd imagine? In my tank I get a weird flexing of the water. Opposite corners of the tank peak at the same time.
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