Define requirements and constraints
Record the baseline and check lower dilution of waste and heat. Do not infer the aquarium's condition from a single sign. Measure the real space, identify connections and preserve clearance for cooling and service.
Then compare narrow margins for evaporation, dosing and overfeeding with livestock needs and recent changes. Compare useful capacity, energy and compatibility with the complete setup.
Install for future maintenance
Adjust one variable and assess a volume matched to stability and adult size before continuing. Keep a reference so the result can be compared. Test the assembly under controlled conditions and record settings that must be repeated.
Do not select a nano tank on price or footprint without calculating load and maintenance.