Hi Rain291,
From the specs of Shiruba XB303, (http://www.eastoceansg.com/shop-by-b...er-360l-h.html) so if your 20 gallon tank is 80 litres max, then it should be ok.
However, you need to consider whether does it provide sufficient turnover rate for your tank (360/80 = 4.5 turnover rate/hr) based on the following factors:
- Type of livestock (goldfish/tetra/shrimps)
- Bioload (light/heavy)
- Landscape (planted/bare tank)
- Circulation (any dead spots if your tank is planted etc)
I have not used it before, but some articles online recommend pushing the turnover rate to as high as 10x depending on what is in your tank.
Perhaps you can share what is your 20 gallon tank will be used for so that we provide better suggestions.
Hope my input helps!









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