So this evening I almost had a heart attach, sat watching telly and suddenly heard a loud snap very similar to glass cracking come from the direction of my 700ltr aquarium, I was up and across the room as fast as superman in a panic thinking a panel had cracked, spent half hour or so looking but couldn't find any cracks or any water leaks, wasn't until I had calmed down that I looked across and saw what had caused the noise....
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I've heard some of my bowls make tiny little ticking noises on occaision when they are very very dry and I bring them indoors but this was really loud.