Best canister for $100? There are better ones as far as bio capacity since the magnum has a very small canister, and it is a powerhog. Hob filters might be better suited for what you're looking for. An ac110 costs about 75$ and moves over twice the amount of water, but....... I've had a magnum that's been in service for almost 20 years. It's not my only filter but they are workhorses. For extra mech or chemical filtration they are great. I Would recommend as a secondary or specialty filter. Just turned mine off to get ready for a water change. Oldest piece of gear I own
And $100 is a good price