Hi All, So I noticed my shrimp were huddling at the top of the tank yesterday morning. I figured that something had spiked and I better do a water change quickly. No sweat, did a 50% and the fish who were looking ok to begin with were totally stoked. The shrimp still migrated back to the top though. In the evening, I did another 50% change. Again this morning they are all huddled near the top. All I can think of is that something keeps spiking but that is awfully fast for anything to spike after those kinds of water changes in a 2 year old heavily planted tank. The second possibility is that when I put my logs back in (log!) they can get closer to the surface and they are going there just because they can and they like it. Any ideas? Thanks Shango _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member