Inside your canister filter, I had a fuval (for like 2 days long story) with a bunch of different compartments for that stuff. That's were I personally would but it, but I sure it wouldn't hurt being in the tank in front of the powerhead just wouldn't look the best.
If you are interested in learning about reefkeeping or have a problem with your reef, our reefkeeping community is here to help. Feel free to ask a question or search our site. We have lots of experienced reefkeepers that are willing to provide free reefkeeping advice!
Besides being a great resource for all levels of reef aquarium hobbyists, CaptiveReefs is a social experience that will enhance your enjoyment of reefkeeping. CaptiveReefs is committed to connecting reefkeepers with the support and information they need to grow beautiful coral reef aquariums.