I'm going to have a 65 gallon Discus tank. I hear a Canister Filter is not the best with Discus since it does not give off enough Oxygen for Discus. What you guys think?
depending on which filter you use most filters have a media in them called biomax which helps oxygenate the water also consider buying a air pump to add oxygen into the water .
Put the spray bar half above water half below the water. This will provide enought oxygen. If you are worried put an airs tone in the tank or a powerhead.
I use a canister filter for my Discus 55g and also have a Waterlife Ghost 3 air pump, it has 2 outlets so I have airstones at either end of the tank, seems to do just fine