Meh. I'm more worried about tank failure than a canister leak. Plumbing is plumbing. Plenty of examples of people destroying walls, stands with leaks from HOB's out there, too. IIRC, my Fluval HOB has an o-ring outside the aquarium, too. >90% of these leaks are operator error. I chalk the rest up to cheap equipment or lack of attentiveness.You are lucky to have discovered the leak early to prevent further damage. There were accidents reported of leaky canister that drained the tank over night. There are no safe canisters as long as external hoses, clamps and O ring are used, and any break can turn into a fountain. HOBs are the safest because there is no external plumbing,
Replace hoses when they get stiff, inspect seals, etc. and good canisters are plenty reliable.