Quote:
Originally Posted by rick4him
. In fact Step 1 doesn't contain any phosphate's , it doesn't come into step 2.
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If step 1 dosent have PO4 then that is why you have algae. Not every tank is the same, but you need to add some PO4 if you want to get rid of the GSA on the rocks. Do you have hard green spots on the glass as well?