I like serpant stars myself. Brittles can be hit or miss and I think they look creepy. Sand sifters are great too and they do a great job at keeping things cleaned up. However, if you don't have the right setup, they can sift the sand out from under your rock creating an avalanche. I knew I was adding a sand sifter star to my tank when I set it up, so I embedded sections of PVC in the sand bed to create a platform for my liverock. That way, sand sifters can sift away and the liverock stays put.