QS100A It is suitable for filtration and oxygenation of 10-30gallon fish tank, and can be used alone within 10gallon.
Aquariums above 15gallon are best equipped with a waterfall filter. Achieve perfect work efficiency
QS200A Suitable for filtration and oxygenation of 20-50gallon fish tank, and can be used alone within 20gallon.
Aquariums above 30gallon are best equipped with a waterfall filter. Achieve perfect work efficiency.
xy180 Suitable for 2.5gallon --- 15gallon fish tank, it needs to be used with hanging filter.
xy380 Suitable for 15gallon --- 50 gallon or bigger fish tank, it needs to be used with hanging filter.
The above sponge filters need to be used together with the air pump. Sponge filters are used to raise water in new tanks, especially in isolation, treatment and reproduction.