The actual number of gallons isn't nearly as important as the dimensions of the tank. For example, if the tank were 3 feet long and 12 inches tall you could keep a whole lot more fish than if the tank were 12 inches long and 3 feet tall.
I think it's best to keep schooling fish in large schools of 10 or more. In my opinion if you have to cut the school size down to a "minimum" in order to keep them, then the tank is too small/the fish are too large.
Hatchetfish for sure you should have at least 8-10, and same with the corys although it's not as important for them as it is for the hatchets, which are a naturally skittish and nervous fish.
I'm not familiar with the cichlids you mentioned but being Africans, red flags immediately go up. I know some Africans like kribensis are good community fish, but the vast majority of them are not.
I'm not familiar with the cichlids you mentioned but being Africans, red flags immediately go up. I know some Africans like kribensis are good community fish, but the vast majority of them are not.
That's a good shape - you can definitely keep the larger schools in there. A little fast research indicates that the cichlid is community safe, and that they like to be in a small group. So I would up the Corys and hatchets and see what's what. You might want to add another school for the middle of the tank. You might not
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