Hello Fernando,
The current version of Marine Aquarium for Mac OS X is 2.0.6. There isn't yet a version 2.1. If you have version 2.0.1 then you have an old version which is known to have the bubbles problem. I just went to the SereneScreen site and checked that the current version for download is in fact 2.0.6, so you should be able to get it there without having to pay anything.
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