I dose Microbacter7, I don't believe it helps with any type of regular algae but it does seem to help (eliminate) with the cyano that is sometimes common with carbon dosing. When I don't dose Microbacter7 for a few days, like on vacation, I get some cyano in my sump. When I dose the Microbacter7 it takes around 48 hours for the cyano to disappear and it never comes back as long as I keep dosing. It also makes the water unbelievably clear for around 30 min right after I dose, not sure what is causing that though.