Need help with setting up Koralias

i think i figured out how to hook up my nano koralia's for my puffers 20 gall. i have these parts, do i hook one magnent to the little red circle thing and just place the other magnent on the outside of the tank? these are the parts

 

Yup, that's it. One side should have a hole there to insert the red rod. It is actually a suction cup as well as a magnet. Use the suction to get it where you want it, then the outer magnet to secure it.

 

Yes.

 

they both have holes so i guess it doesnt matter which one i stick the into the red piece?

thanks! just wanted make sure

 

is it normally pretty hard to get the magnent to hook up to the red piece?

edit: just got it on, now im going to rinse the ph off in the sink and put it in the tank, i currently have a mj1200 in his 20tall but its just too much flow for him