Hi thanks for sharing, but whats a HOB? Canister? do you mean internal filter ?IMO, air pumps/sponge filters are the bare minimum. The oxygen only goes in one direction(up). I'm not going to argue that fish can survive on this. Having a canister or HOB add so much more. They push the oxygen down in a tank(before it goes up).
When power goes out the effects of a bubbler wears out faster then the other filters