Eh, other than Nass snails and diamond gobies, not really. They get big too, so eh. Will @ LGF keeps telling me twinspot gobies and/or hector/rainford's gobies will sift as well, but I'm definitely not willing to sacrifice one of the later. WWM says to keep the twinspots in pairs if they come in like that so....maybe a new pair for your tank? I might look into it after I move.