Hi, all. I have a 125 Gal tank that I am in no hurry to set up because I want to do it right and with the right supplies. I currently have an Eheim 2217 canister filter as well as gravel, rocks, and plants. I have a heater for a 55 gal tank and am sure I will need another. I am concerned about water circulation. Will the Eheim 2217 be enough? Do I need a pump or anything else that will make my tank a success? Thanks to all who reply.