I am in the process of getting everything together for my 300 gallon black water tank and I've hit a snag. I can't decide if I want to run a sump setup or canister. I am going to have floating plants in the tank as well as a 3D background. If I run sump the floating plants will be drawn towards the overflows but if I run a canister the only option I see for heating the tank is to use the eheim with built in heater and I'm going to have to run like 4 of them. Let me know what y'all think.