Okay, so this little gadget? TOTAL game-changer. I've used it for my 40-gallon tank during power outages AND for keeping bait alive on weekend fishing trips - it somehow does both jobs perfectly!
The battery life blew my mind. Left it on intermittent mode (10sec on/10sec off) during a 28-hour outage and it was STILL going when power returned. My neighbor's fish died but mine partied on thanks to this thing.
Super quiet - like 'I had to check if it was still working' quiet. The rubber feet actually work (shocking for cheap aquarium gear). Only complaint? The instructions might as well be hieroglyphics. But hey, it's just an on/off button and mode switch - not rocket science.
Pro tip: The included air stone is decent but upgrade to a wooden one if you're using it for bait buckets. Makes the bubbles extra fine and keeps minnows happier longer.