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Would a hob 100 Reef octopus protein skimmer and a canister filter be enough for a 90 gal tank also have a hob filter for bio balls or something or do I need a sump
For filtration the live rock that we put in our tanks serves as our filter so it really relies on the flow in the tank. Shoot for 10x - 40x the tank volume per hour in flow.
If you were going FOWLR, you may be OK with that, but if you're considering reef, I'd recommend against a canister.... not saying it can't be done, but they are a maintenance nightmare. IMO, anything over a 55g reef would be best served having a sump.