Maintaining a 400-liter tank for nano species.

[mezora]

I'm in the process of revamping the tank and I've been pondering what inhabitants to introduce.

Schooling nano species in groups could be an intriguing option.

Would I be underutilizing the space, though? Perhaps incorporating a central focal point, such as a Betta accompanied by a few females, would be more effective.

I just checked my water parameters, and it's actually moderate soft, not hard at all.

[sSjey]

When you see the words the water company uses, it's easy to get the wrong idea - they often make it sound harder than it actually is.

Take a look at the numbers instead. My water test results show 25.9 mg/l of calcium. This isn't a unit we typically use in fishkeeping, so let's convert it to something more familiar. Fish profiles usually list hardness in either dH or ppm.

Doing the conversion, 25.9 mg/l of calcium is equivalent to 3.6 dH and 64 ppm. This puts my water at a soft level - not very soft, but close.

[boomer]

With that info, we've got a good direction to head in. Soft and very soft water species are the way to go, which covers a lot of fish from South America and SE Asia. The 120cm/4 foot tank length is also a plus.