So I've seen some bad reviews about it but can't figure out why. I've been using it on a 20 gallon reef for a few months now. There are just a few things to know: 1. Be patient! It takes a day or two to get started. A biofilm should form on the drip tray. This also applies after cleaning.2. Start with the cup at the bottom. As it thickens, gradually raise the mug until the lean mass is less watery and darker.3. If you don't have small bubbles or none at all, try blowing out the air intake. It works wonders.4. When small bubbles start to leak into the tank from the drain hole, carefully clean the sponge. This is a great little skimmer for the price and for the hob. I highly recommend it.
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