Check adult requirements
Record the baseline and check pair or harem structure by species. Do not infer the aquarium's condition from a single sign. Confirm scientific identity, adult size, diet, social behaviour and swimming zone.
Then compare caves, sight breaks and bottom territory with livestock needs and recent changes. Look for genuine overlap in water, flow, territory and feeding throughout the year.
Assess compatibility and welfare
Adjust one variable and assess tankmates that avoid breeding sites and shelters before continuing. Keep a reference so the result can be compared. Plan the complete group and monitor feeding, breathing, injury, shelter and space use.
Dwarf does not mean peaceful or suitable for a nano aquarium.