I recently Changed my Tank water  I have a 55 gallon tank that is nice and   
   clear , I    
   let it sit for 24 hours before adding any fish , the Ph Level is at 7.0    
   I bought several little Freshwater Tropical fish , couple of pineapple Swords   
   , neon    
   tetras  and spotted tetras  Also bought 2 mini plecko's   All the fish died   
   within 24    
   hours expect for 1 pleko ,  the water temp is between 76 and 78  any ideas of   
   what    
   could possibly be wrong , would it possibly be the filter  the current is   
   pretty strong    
   but  I dont think its strong enough ,, prior to that I had  4 fancy tailed   
   goldfish , 3    
   tiger barbs in the tank and a huge plecko , those lasted a very long time    
      
             any suggestions , My wife really likes the colorful  Tropical blend   
   rather    
   than the  Pond blend    
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