Hi
I bought 4 spotted silver dollars this morning but when i put them in my tank tehy just sat on teh bottom, not looking very good.
do they play dead at first?
As truck says, how did acclimatise, how long for, what temp is the tank at?
Spotted SD get to about 5" I believe and are pretty skittish, it doesnt take much to frighten them, aside from a large tank, plenty of fake plants will be needed to provide them with cover to make them less shy.
Keep the tank lights off for a while and if you can tell us your stats and answer the other questions might be helpful