i may hold off on the koralia for now as i have had another idea i will try . at the mo i run an eheim 2212 internal i run alongside the external. the spraybar of the external is set at the surface to provide surface aggitation.
so at 1st i will try keeping the existing external running like this , the 2nd external il have the spraybar lower in the water column to give a little flow in the lower regions , if i need a little extra or get a dead spot i need to get rid of i may run the internal with no media just to provide a gentle current to help spread nutrients around the tank for the plants ,without giving too strong a current for the discus. well thats the theory anyway .altho im sure it will prove to be a case of trial and error, but id rather have to replace plants than discus so i will put all my effort into finding a happy medium whereby i can get enough flow for the plants without upsetting the discus.