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. 

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