Hi.
Define dangerous?
It all depend on the workmanship of the tank maker and how the 1st owner take care of it.
I have seen tank with braces leak,so to answer your question, why not fill up the tank with water and let it sit
for a couple of days.
Here is a 800lt tank with no braces.
http://www.aquacube.it/aqua/en/speci...a_faberi_2007/
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