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I have had my tank running for around seven months, and feel that despite a few difficulties everything has been going fairly well. In the past week though, I have been having some problems, first I noticed that my Clove Polyps were starting to look rather closed up, Nitrates were higher than usual so I did another water change. I then realized that my Turbo snail had died I had when I saw other snails and a hermit crab converging on it. I then removed the corpse. I used what salt mix I had left on a water change so I unfortunately can't do another one until I get more tomorrow. My parameters are as follows: Ammonia: 0 Nitrite: 0.5 Nitrate: 0.5, Ph: 8.0, Dkh: 9.5, Salinity: 1.024 Anyone have ideas on what might be going on? I just have a few questions 1. Could the Turbo snail dying have caused this? Or was its death the result of this Nitrite spike? 2. How sensitive usually are Clove Polyps? Mine went from looking good to seemingly dead in just a few days.

One of my turbo snails has a strange hitch hiker on its back. It looks like another shell. At first I thought it was one of the baby snails on it's back just chilling. But then I saw what was in the snail and got concerned. The flesh did not look like the other snails, it was black. And it would occasionally stick out and poke around. I have no idea what this could be and researching hasn't helped me either. Would really appreciate some help. Here is a video of the hitchhiker: