Penn Plax Tank 20g

Penn Plax's 20-gallon starter is the choice for beginners who know from the start they want a community fish setup. The additional volume compared to 10-gallon kits makes stocking multiple species practical and gives a much longer window to catch and correct water quality issues before fish are affected. The included curved glass front provides a wider viewing angle. The filter and lighting are starter-grade but functional. At $90 it's a fair entry price for 20 gallons of usable volume.