Apistogramma Coummunity tank (20 long)

[derekw]

I currently have a 20 gallon long aquarium that has 1 male juvenile sunset apisto. I also have 6 neon tetras. I am creating a biotope of the Nanay river. My question is: is the tank large enough for 3 more neons, and 5 rummy nose tetra? I am running a fluval 307 cannister filter and have some leaf litter for the apisto to hider in. Is it a better option to add 5 more neons instead?

 

[MacZ]

I find rummynose tetras should be kept in at least 1.5m tanks and in far greater numbers. Just stock up the neon tetras and rather think about a species for the upper regions than another midwater swimmer. Dwarf hatchets or pencilfish.