Metricide
I got my hands on some Metricide 28, I dosed 10ml directly onto some BBA, it did absolutely nothing but within 2 days my fish were either gasping on the surface or dead on the bottom. I bought some Flourish Excel and dosed 20ml onto the BBA all the fish are fine and the BBA pink and dead.
Moral of the story unless you know what you are doing and have a need for large doses just stick to the excel, it costs more but it works far better and doesn't carry the risk.
I got my hands on some Metricide 28, I dosed 10ml directly onto some BBA, it did absolutely nothing but within 2 days my fish were either gasping on the surface or dead on the bottom. I bought some Flourish Excel and dosed 20ml onto the BBA all the fish are fine and the BBA pink and dead.
Moral of the story unless you know what you are doing and have a need for large doses just stick to the excel, it costs more but it works far better and doesn't carry the risk.