I was still having algae problems with the probidio until I was told to get rid of the GFO. Other phosphate removal media may not effect it. You may want to check the probidio web site to see what they say. All I use is the biodigest & bioptim.
In my 33 gal with 25gal sump (around 40gal volume) I was dosing 1 each of biodigest & bioptim every 14 days. I just checked the product website & you should use one of each every 15 days.
Hope that helps. I did notice with mine it took a good 6 to 8 weeks before I saw things happening. But for sure to increase your water changes.
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