i did a similar thing, i was siphooning from my 125 into a 5 gal bucket and the hose in the bucket came out so it went all over the floor and i was also on the computer and i came back when the bucket would of been full to a soaking wet rug all around my tanks
i also over flowed the buckets a couple of times
funny thin g about this is i have a bucket clamp to attach the hose to the rim of the bucket but i was to lazy to find it (in a cabinit with other fish stuff) so lesson learned