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I just got home from work to find that my HOB has been running for I don't even know how long, with no water being pumped through it, I fixed it for now but now I'm extremely worried, I'm going away for the weekend and nobody will be coming to check on my fish, have timers set up and vacation feeders ready to go, if the same thing happens again can the HOB catch fire??? I have a cobalt ext canister filter that I just hooked up less than two weeks ago running but I doubt it has enough BB to sustain my fish, I'm nearly through my cycle, should I just unplug it and hope for the best or will it be safe to leave running??