I am cycling a 20 gallon hex tank with a build for a nano reef. For mechanical filtration I am running an Aquamaxx HOB 1 Protein Skimmer (https://www.saltwateraquarium.com/h...er-aquamaxx/?gclid=CP65qKy7l84CFYKFaQodg1QC6A) It's running well, but my concern is in the event of need for any type of chemical filtration, I am not sure where to put that. Rim space for any type of "in tank" or HOB equipment on a small hex is very limited There are small media reactors available, but don't want to take up excess room inside the tank. What is everyone's thoughts about adding a small canister for chemical filtration purposes? I am very dedicated to keep filter systems clean to avoid nitrates. Would really like advice please!