they recommend a 2232 for a 35gal, and the 2234 is for a 65gal. I do not know what they say for the 2233. I am planning on using my 2233 for a 20L.
It *should* work fine for a basic planted 36, but if it is heavily planted you may want an additional powerhead/filter to help with flow. Just keep an eye on it. Oh, and stocking would also have a factor in that.