Hello. I have a 155 gallon tank full of African cichlids. They have been shaking constantly and scratching on the sand. Maybe 1 or 2 out of 25 had a white spot on them. Assumed it was ick. Went to the pet store they gave me API Melafix and Pimafix. Since this last Saturday I've lost 5 fish. What is going on? It isn't dead yet but it's the worst one of the fish left. Click image for larger version.  Name: uploadfromtaptalk1425956759535.jpg  Views: 15  Size: 258.8 KB  ID: 23770Click image for larger version.  Name: uploadfromtaptalk1425956825004.jpg  Views: 15  Size: 272.4 KB  ID: 23771