I’m not sure there’s a favorite brand of canister here. I’ll let others weigh in on that. I do have a couple Eheim pro 3’s on my 75 gal tank. The best thing I bought for that was a pre filter that fits on the intake tube (inside the tank). I learned about them here and that is a god send as it traps gunk and is easily removed during wc for easy cleaning. If you clean that a couple times a week, you don’t have to clean the canister as often. Canisters are a pain to clean and discus like their water shining. If only my house looked as good as my tanks. Ha ha
I also love my python. It’s a suction hose that you attach to your faucet and makes wc’s much easier. If you don’t have a ph swing you can also use it to refill the tank. I always aged my water with discus though to avoid micro bubbles, but maybe others will have some pearls to share with you. hth
Patty