After freshwater fish ponds are disinfected with benzalkonium bromide and glutaraldehyde, why does the water smell fishy? Quick return and urgent needs

Hello, I'm from Qingdao Kewei. After using the disinfectant, is it because this thing killed some algae? In fact, the stench is due to the death and decay of algae, including the smell of some algae metabolites such as microcystins. In this case, the odor will be eliminated within a few hours by using Jiedu Bao. I want to know, right?