ph what???? help needed please

hi guys /girls I have a question for all who can help... right.. my ph level is 6.5 because I am using PROPER PH 6.5 Iwhich I bought from pets at home lol,,I have also bought some canna ph down bloom and have done some testing with that which gives a ph reading of 4.0, which is too low what can I do to get it to around 5.0 to 6.0?? as I think 6.5 is too high for my grow as I have cal mag deficiency(also bought some canna magnesium) can you help please??
 
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