lol how shoddy. It was only $30. That explains everything
. I bought it out of curiosity, and thought it might speed up the cycling of about 15 lbs of liverock I bought. Yeah right. I'm not going to refund it. Instead I'm keeping it as a momento to remind me not to buy stupid stuff again heh.
First of all, the "skimmer" walls are panels that slide down into the HOB filter. Bubbles escape the riser tube, and instead collect along these slide in walls, and not the riser tube.
Second, tuning the bubbles is VERY hard. You have to open it up enough for a stream of bubbles, but if you open it just a touch too much, the siphon is broken and the pump stops bringing up water all together.
Third, it's VERY noisy. extremely noisy. noisier than my mag 7 (in dire need of cleaning), rattling on a sump floor. It's collection cup even makes it worse, and ressonates the noise like a guitar body.
Fourth, it's hanging part is so narrow, it didn't fit on the plastic frame of the tank. I had to cut some of the frame back to get it on. I think it's only for hanging on bare glass.
Fifth, it's all very low build quality. An aquaclear of the same price is much higher quality than one of these. Even though there's extra plastic in these than an aquaclear the same price, it's still very low quality. The O ring around the pump wasn't even seated properly when I bought it and it leaked water from the get-go. Had to fight with it, because the O ring was too big.
Basically, I'd only recommend it for a 5 gallon tank or smaller. And with the noise it outputs, I don't know many people who'd want one on a small tank in their office or something. It's a pain to tune without stopping it from working all together. Save yourself the grief, and just do the "nano sized" 1 gallon water change each week
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If you REALLY want a nano-sized skimmer, there are threads around the net of people modifying their aquaclears into air driven skimmers that work much better than one of these.