mine isn't as bad as some of these... but when i first got my 200G and was setting it up, the hose i used to feed water back out of my tank into a pipe (normally for washer's to feed water out) was too large causing the flow rate to be too strong and causing a back flood which i didn't notice for about 15 min... needless to say floor was quite wet and i only just moved into my new flat with real hard wood floors :S
