We discovered about 5 litres of water on the floor next to our tropical community tank last night and am puzzled to where it came from. After a quick check of the tank we couldnt find any cracks or leaks. The venturi had a few drops of water in it and have figured it must have been that.

The tank has an air stone situated pretty close to the the pump intake. Could the air from the air stone have made the venutri back syphon? The tube from the air pump has a check valve and hadnt been turned off??

HELP!

Could be that, or something that was trailing out of your tank could've taken the water out via capillary action. I've even had the string from a breeding trap do it before.