Jet-black body, red tail. It guards a territory near the bottom and chases off its own kind and look-alikes. One per tank, and since it reaches 12 cm, keep it in a 120 cm tank.
The largest group where none died in 90 days. Tap water · black sand · bacteria starter on day 1 · fish added on day 10 · 25% weekly water changes.
They fight their own kind, so keep only one per tank.
Run a 120 cm standard tank with 1 yourself →The same rules the engine uses for tankmates.
No eating or bullying either way, with plenty of overlap in temperature and pH. Fish that swim at a different level come first.
The numbers on this page come from the Water Kiwoogi simulator model; real tanks can differ.