Just to be clear.... the water flows under the first baffle then over the second and under the third... is this the way they are setup?.... this is the prefered method... there are few to no bubbles in the water as it passes under the 3rd baffle thus decreasing the number of bubbles that are returned to the display tank.
Most of the bubbles are likely a result of the water falling 1 1/2" ...raising the water level to almost even with the final baffle should decrease the number of bubbles... but you will still get more bubbles than the under-over-under baffle configuration
HTH
Dan
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