Newbie with a Nano

[ponokareefer]

Canister filters tend to cause a lot of problems unless you clean them every other day. They aren't recommended for salt water. Your live rock will act as a filter for you, and a skimmer will do the rest.

As for the aiptasia, I'd get the rock that has it out of the tank. You might be able to get rid of it, but you might not. I wouldn't take the risk since you are just starting out. They can become a nightmare, and that's the last thing you want just starting out.

Good luck!