Small tanks (under 40L) have rapidly fluctuating water parameters, are harder to heat stably, and severely limit your fish choices. A 60-100L tank is a far better starting point. Larger tanks have more stable chemistry, accommodate more interesting livestock combinations, and are actually easier to maintain. Consider fish at adult size – not at purchase size. Many fish sold as small juveniles grow to 15-30cm or more. A Plecostomus sold as a 5cm juvenile can reach 60cm. A Flowerhorn sold in a small bag can need a 200L tank as an adult. Research adult size before purchasing every single time. Related fish: Bristlenose Pleco (manageable size) vs Plecostomus (grows to 60cm).
