Not sure what I have going on here. I'm new to this so here is a short history. On Jan. 6th I got a 44gal pentagon tank, added 25lbs of medium to fine substrate, stress zyme, and stress coat. After 4 days (wish I would have found this forum sooner) I took my water to my LFS, they tested it and informed me that it was perfect.....so I bought 4 cichlids. The first 9 days I had 1 day of cloudiness but it cleared in 1 day and all seemed well. Jan. 19th I tested my water and found I had 2ppm Ammonia in the tank. My LFS reccomended a daily 15-20% water change...which I did for aprox 7 days. Now the ammonia is gone, but my tank is super cloudy and my ice blue zebra has a clamped tail fin. At one point he was almost floating on top on his side but 24 hours later is still alive and eats well. Did I stress these fish out to much? One other thing, my LFS sold me a product called Acurel F...they said it would clear my water in hours, it didn't. The sick fish problem all started after putting that stuff in. Someone help please , I'm not sure where to go from here.