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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