You need to decide exactly what you're going to keep.
You said you just want "anemones and stuff" but there are several species of anemones, many would grow too large for your tank, and they tend to be unbelievably messy.
That canister filter would be fine for a fish only tank or a fowlr, but it won't necessarily be a great idea for a reef tank depending on the types of corals you plan to keep.