care:
Silver arowanas will adapt to most water supplys with ease, though they do need exellent water quality as in 0 ammonia & nitrite. Nitrates should be kept as low as possible, 20ppm of nitrate being ideal but lower is better. 50-75% water changes should be done at least once a week for these are large producers of high protein waste, more water changes are even better. Temperature should be between 80 and 84 degrees F. slightly higher will not harm them. Minimum tanks size for this fish (though very debatable) should be no less than 270 (6ftx3ftx2ft) gallons for a single arowana. For this fish to live comfortably, grow and live to its FULL potential however, A 478 gal (8ft x 4ft x2ft ) would be the ideal tank size for LIFE (this is of great debate as well). Silver Arowanas are known to be quite "skittish" as far as fish go. They get scared very easily so a heavy tight fitting lid is a nessesity, and these fish are powerful jumpers, a sturdy lid made of materials such as acrylic should be used as arowana have been know to smash straight through glass lids, also a heavy object should be place over the lid as a large silver can knock a lid clear off the tank (as i have experienced)
LOL What perfect is, is behond me 
