I'd say too much flow. I would find a way to make that 406 an indirect current, the cleaner the water the better- but you don't want a river feel/flow for discus. Have fun!
You have a 65g tank and filters that you are using together are for upto 500g tanks. Plus it is too much water flow, you can use a make a spray bar for kill the flow.
I would suggest just use 406 and a size 5 sponge filter.
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