I'm glad to hear that you're so concerned about the welfare of your 
fish.  Such a high ph causes undue stress on your fish and makes it 
difficult to keep the ammonia levels down.  At a high ph there are 
minimal free hydrogen atoms that can combine with ammonia (NH3) and 
convert it to ammonium (NH4).  The former is extremely toxic at low 
levels, whereas the latter is not.  Good biological fitration will take 
care of this...  which you must have since your othe water parameters 
tested okay.  To keep the ph lower you can use ph blockers, which are 
also called ph stabalizers.  These are relatively harmless, but can be 
expensive over time.  A more natural approach is to add some peat to 
your filter media which will soften the water and allow you to control 
the ph range.  Another option is to add distilled water during partial 
water changes.  This will reduce the hardness.  A more expensive 
(initially) solution is to purchase a reverse osmosis unit.  These 
range from 70.00 - 200.00 dollars.  Most larger pet stores carry a full 
line of them.  The store I generally use is named That Pet Place and 
can be reached at 1-800-733-3829.  They will send you a free catalog.  
with live plants (This is a long term approach).  Plants give off 
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