TANK: 48" (122 cm) or 55 gallons (210 L) is adequate for smaller fish.  Adult fish should be moved to a tank measuring at least 56" (142 cm) with a capacity of at least 75 gallons (285 L).  The tank should be large and roomy with lots of open swimming areas.  Provide hiding places with solid rock structures and driftwood.  The lighting should be dimmed and use a dark gravel bottom.  Live plants will usually be consumed, so use plastic plants as an alternative.  Some robust, sturdy plants may not be bothered if the fish are fed sufficiently.  Silver Dollars prefer shallow tanks.
WATER: pH 6-7.5 (6.8), 4-18 dH (12), 75-82°F (24-28°C)