perch are really easy to keep. this summer i had a 20 gallon tank w/ 4 largemouth bass, 5 sunfish, and 3 perch, all 1" or smaller. the perch were really timid and would usually hide unless it was feeding time
Yellow perch can be a blast to have in tank. I have 3 small perch (4 - 8") in a 75. They hang out with a brown bullhead (13"), a bowfin (13") and a pile of small bluegills and pumpkinseed sunfish.
Over the years I have had some decent perch. My largest yellow perch measured 13.5" and would eat medium-sized shiners out of my hand. Good stuff.