I just set up a new tank yesterday using established canister filters and tons of plants. I will be adding my fish slowly as well. I have 10 apple snails that I want to go into this tank. My question is when can I add the snails?
Since you are using an established filter and the tank is planted, I agree with Jinx. Go ahead and add them. Just keep an eye on the parameters and make sure they are stable before you add more fish.