What are the consequences of long-term overuse of EM bacteria?

Long-term excessive use of EM bacteria will make the water of the culture pond black, how is it? There are many reasons for the blackening of aquaculture water, which is not necessarily caused by excessive use of EM bacteria. Generally slightly increase the use of water quality will not appear black. A friend of mine in Guangdong bought EM strain himself, fermented it with brown sugar and clean water, and poured it into his own shrimp pond, basically once a week, using 1-2 kg / mu at a time, without listening to him talk about the blackening of the water. If we have to analyze the reasons for the blackening of the water caused by the excessive use of EM bacteria, it may be due to the fact that the amount of EM bacteria is too large, and the color of the EM bacteria itself changes the color of the water body after long-term accumulation. It's brown sugar that oxidizes! -- you can't use it. Check by yourself,-- I don't know much about ~-- you have to go through physical inspection and analysis before you can come to a conclusion. Reply that the great white shark is not blackened by the water! It's your EM that has gone bad. I often use EM with my friends below, and there is no problem you mentioned. Of course, everything is not absolute. We should believe in the quality of the products. Now the quality of EM made by some manufacturers is really not very good.