Help with return pipe size - already made a mistake

[Saj]

I'm setting up a nano and i'm makring loads of mistakes.

The first mistake i made was not washing the sand , it look like my sons poured milk into the water.

The second and most important mistake i made was juding the return too small.

The sump has a ehime 1060 which uses a 25mm pipe to return to the nano - in the photo's is the grey pipe. The return is a 32mm (equvalant in inches - in white).
I switch on the 1060 and with 30 or so seconds the nano is over flowing.

Does any one have any ideas how i can over come this? I really want to use a 1060 as the return.

I think the alternative is drilling another return, I have the glass drill all I need is the tank connector. If do you think a 2 x 32mm will work?

The second alternative is that i remove the white pipe and have a glass over flow. I would like the idea of an overflow but i just dont know if it will work.

 

[BCreefmaker]

one thing you might try is cutting slots or drilling some holes in the top of the pipe blow your current water level in the picture. or you can put a "t" section that runs back into your sump and a valve on your tank return line to regulate your pumps flow back into the tank.

 

[Melbourne]

A few things you can try, place a ball valve on the outlet of your Eheim to reduce the flow to the point that your tank doesn't overflow. Drill a second overflow so you can handle the added flow from your return pump. Its always best to have a overflow that can handle more than your return pump in case you get a partial clog, etc. If you are using a straight pipe for a return you may want to rig up a durso, not sure how much air you are getting into the line going to your sump.