Thanks
It goes from the pump thru 25mm pressure pipe up to an elbow that goes over the top of the tank, and it is then glued under the bracing. the pipe goes round the inside of all the bracing around the tank. There are three outlets evenly spaced at the front and i on each side in the middle. The water exits thru 3/4 loc-line.
I didn't drill a hole in the tank as it was going to be to close to the edges of the tank and strength was an issue.
The tank is only made from 10mm glass (30" high tank)
Make sense, will try and get some better photos of it.