It kind of helps though... If there was a real fish, the housemates would know that he talks.Why can't they come up with something other than an imaginary fish down a drain, that the housemates can neither see or hear in the drain that it's supposedly in?
The fish needs to go, end of story! Not funny or entertaining at all have no idea who came up with the concept but must be a total wanker and the people who actually implemented the concept are worse!