I think it depends on what media you use.. Check the dkh of your effluent.. I was told that it shou ld be in teh high 30's to low 40's then adjust the ph from there....
I think 6.4 is going to be a little low.. IF you go too low with ARM it kinda gets mushy.. What is the dkh of your effluent? Try starting around 6.7 or so...
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