yeah. they typically dont cause trouble, but multiply rapidly. i always tried to keep them out of my tank. worked for about 8 months, then there were many. after that its a loosing battle. took weimers advice on another thread. he said remove 10 a day and it will stay under control.... just too lazy to keep up on them
a harlequin shrimp will kill em off quickly, along with any other stars, but then it would just die of sarvation and i have no idea how hard they are to catch and return either. so not a very resposible option.