It is either pump cavitation or the fact that the radiator is on the top of your system placed horizontally. What you will need to do is keep topping off the resevior (possibly put some of that pump filter foam in there) and just let it run for a few weeks. Tilting the case back and forth wouldnt hurt when you lose the froth but just have bubbles left because the radiator will probably have bubbles swirling in it.
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