Thanks much. You saved me the trouble of asking if it's normal for shrimp to do that. I got some from Mgamer20o0, and this morning one had crawled into my AC 70 intake, and another was hanging on to one of the lips on the TF 60, a lot like yours are doing. The one that crawled into the intake? I turned off the filter, got him out, just to see him swim back up and climb back in. He's either going to get a work out while he's eating, or he'll get beaten up by the impeller, I guess. Any advice on what size sponges I should get for an AC 70 intake and a Top Fin 60 intake?