Well I have a 5 gallon aquarium, it fits in very well although there is some room on the sides. The filtering is very good. I put some duckweed in my tank and all the dead duckweed and roots were sucked into the filter. I can't say anything about the biological filtering because my pool hasn't been used yet. Ordered with all accessories. The suction cups are good, easy to insert when they come loose.
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