知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 So in the event you have twenty Zebrafish (Danios), you'll need at the very least a twenty gallon tank. This rule only holds correct for many fish though. As said higher than, some species of fish get massive, so You will need to debate good tank size https://www.petskyonline.com/aquatic-supplies/