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Well in that case the "guideline" (very rough often not accurate) is 1" of slim bodied small fish (that won't grow larger than a few inches as an adult) per US Gallon.
But that very much depends on the tank setup - type of fish - filtration etc.
So in effect you can keep 10" of small fish in a 10 US gallon tank (such as tetras). But not a 10" fish in a 10 US gallon tank![]()
42 litre. 3 neon, two glowlight, 2 very healthy red robin gourami, two albino cory, 1 peacock goby, all seem much happier without the danios. and one filter shrimpYep agree with the aboveWe need to know what you have at the moment and what size your tank is ?
(Xcm long times Xcm high times Xcm deep) divided by 1000.
for example my tank is 90cm long x 35cm high x 30cm deep
90x35x30
= 95,500cc
=95.5 Lt
divide that by 4 to get US gallons. and there are 2.5cm in an inch