I tested out the tank with ember tetras to see how they fish would fare in there with a sponge filter, and these guys were terrified for the day they were in there. All of my microfish are easily scared and very timid, so I wanted to test out with some cheap fish instead of the CPDs, which cost a lot more. I want to use it as a hatchery of some sort.. I do have a 10g lying around, too, but GF wouldn’t be too happy if I set up another tank.