I didn't know what to expect when I ordered two of these but wasn't sure if it was the real one largest. It ended up being a bit high for some 1 gallon cubes, but they work pretty well for some of the 3 gallon setups I've made for roosters. I used a 10 gallon Aqueon air pump with a splitter to connect both air lines and also installed a variable flow valve on the line which obviously received more air - this helped me control the amount of air (and therefore suction ) to balance. between two filters. They've definitely done their little job so far! I even caught a piece of floating chickweed that got caught on the foam filter. That really impressed me considering that this particular piece of chickweed was about the size of an entire filter as a whole. I don't know if I would recommend it as a standalone filter for anything larger than 1.5-2 gallons, but as these are additions to the aqueon 10 shrimp filters in these cubes I'm perfectly happy with them. My attached video shows them in action before I attached the flow rate valve, so the left filter may appear to have more airflow. The video shouldn't just show sponge filters either, so keep that in mind if you decide to watch it.
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