Amazing. I have a 100 gallon tank and this thing keeps strong, healthy currants in the tank. The suction cup is good when used properly. I read reviews that it was too open in the front. If your little fish can't handle the 800 gallon per hour flow, they won't even get in. The only drawback for me was the length of the cable. Besides that, I think it's great and I can only recommend it. Update: 8 months later the sucker gave up. I've only moved it 4 times since I bought it about 8 months ago and the suction cup no longer sticks to the glass.
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