I would never use a canister filter on any of my tanks unless it was for chemical filtration only.
Since you have a 75g and you want to go totally HOB, I have used Emperor 400 filters with much success. You don't immediately need a protein skimmer but you can get one, and when you do - I would get an Octopus 75 HOB skimmer. Great quality, easy to set up and worth the money.
You will also need powerheads in your tank for water flow. For a 75g, I recommend either two Koralia 750s OR a Vortech MP40. Do not get sticker shock and turn it down before you research all of the features and watch a few YouTube videos before making a decision.
I also agree with Bob. He's been in the hobby over 30 years and I trust his advice. Macroalgaes are very common in saltwater aquariums. By adding some decorative macroalgae to your display tank - it will grow with nutrients from the fish and then when you harvest the algae, it removes those undesired nitrates and phosphates from your system.
Consider running a sump in the future - You can hide all of your equipment and filtration underneath the tank instead of letting it be all visible in the display.
Also, to make a clean appearance to the tank, consider adding a background. (most experienced reefers like black or blue backgrounds and not the gaudy reef picture backgrounds... And if you already have one, I'm sorry.
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