Unfortunately it just wont work. Silicon will not adhere to plexi-glass (acrylic) at all. You can find a primer (I cant remember the name) that when applied to the acrylic will improve the adhesion, but it still isnt sufficient for structural strength. Sorry to be the bearer of bad news.
Cheers,
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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