Hi - I have a low tech tank and am dosing PPS-Pro with excel daily. My lighting period is 7 hours a day and I do a weekly water changes of about 50%.
I have some severe black spots on my plants and some on my glass. They don't rub off and look like GSA according to threads I followed in the algae forum. If so is there a way I should adjust my dosing. I am using ferts from GLA and mixing according to their directions.