A freshwater aquarium is a small ecosystem with daily rhythms and slow seasons. Built well, it requires less maintenance than a houseplant collection. Built impatiently, it consumes weekends and money in equal measure.
Where to start
Larger tanks are easier than small ones. Water parameters in a 100-litre tank change slowly; in a 30-litre tank, an overfeeding crashes the system overnight. Start with at least 75 litres.
What matters most
Plants stabilise tanks. A planted aquarium is more biologically robust than an unplanted one — plants compete with algae for nutrients and oxygenate the water. Even simple low-light species help.
What to skip
Buy fewer fish than you want. Stock to 60% of guideline limits. The healthiest tanks are visibly under-stocked.