Been looking round my case and just noticed that there is a fold in one of the pipes. Where the fan is at the floor of the case near the psu. The pump is right under the fan and so i was following the pipes and noticed that there is quite a fold in the pipe it would appear it must of been pressed against the fan and so its caused it to bend. But when i checked the pipe wasnt againt the fan but the bend is clearly visible. So this may been a problem causing water to slow down.
Will look in bios in the morning right now need to get some kip. Thanks for the help guys.
Really wish this bird would stop tweeting at night :/ "True story" XD