Just a finding...when buying acrylic try to buy plexi glas...i tried 2 types of acrylic...the normal type i got from those photoframe shop and two from ying kwang who sold plexi glas...
The normal acrylic i used started bending less then a week i place it in my tank and the plexi glas i used for months with no sign of bending.
Just my finding.
Cheers
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