There's always a risk. Check out this thread for the scariest blowout I have seen: http://www.monsterfishkeepers.com/f...ank-owners-worst-nitemare!!&highlight=drywall
I think with acrylic, you will start to see signs of weakness before serious failure (the catastrophe in the linked I referenced above is the exception, not the rule). Glass tanks seem to fail more epicly and don't seem to show warning signs of failure. On acrylic tanks, if the seam starts turn a cloudy white color, that's never a good sign; but I've seen tanks with cloudy seems set up for years without issue, so it's really impossible to tell...keeping lots of water indoors is always a gamble.
I think with acrylic, you will start to see signs of weakness before serious failure (the catastrophe in the linked I referenced above is the exception, not the rule). Glass tanks seem to fail more epicly and don't seem to show warning signs of failure. On acrylic tanks, if the seam starts turn a cloudy white color, that's never a good sign; but I've seen tanks with cloudy seems set up for years without issue, so it's really impossible to tell...keeping lots of water indoors is always a gamble.
... Tore it down and re siliconed it in less then a week. Fish lived in some giant totes with bubblers... Now they are rehomed. Im just glas I didnt get a call one day from home saying come home now your tank is spraying everywhere! My next tank will be silicone and will be BIG.