Originally Posted by peter1215
does seachem make anything that can kill greenhair algae?
You can use a phosphate eliminator such as phosguard, purapad... You need to look at it from the other direction..what is causing the HA? Most likely PO4,[phosphates} you need to test, using a good test kit such as Salifert. It could be that you are overstocked,do not have enough clean up crew,are overfeeding,have insufficient flow, innefficient protein skimmer,or poor water source. Or a combination of these.