Needs high pH and high hardness. Coral sand and calcareous stone are a must, and it can never share a tank with a soil setup or soft-water fish.
The largest group where none died in 90 days. Tap water · coral sand · bacteria starter on day 1 · fish added on day 10 · 25% weekly water changes.
It likes hard water (high pH and hardness). This was calculated with coral sand to harden the water.
Run a 90 cm standard tank with 5 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.