I recently did a water change in my 50 gallon tank which holds my two 6 month old RES. I hadnt done a water change in months so about 1/3 of the water was already evaporated . And the night before I did the water change I accidentally poured too much food in the tank and it had all fallen to the bottom before I could take it up, so that caused my tank to get brownish dirty water. Now I know when you remove most of the water you can cause a bacteria boom makeing the tank to be cloudy. And i experienced this before with my 38 gallon tank I have for my fishes. However this time the cloudyness lasted longer (its been about a week and two days since I cleaned the tank and filter) and it has a slight stench that sort of lingers in my room around the tank. That never happened before either.
I thought it was my filter at first like when i put it back together after cleaning itn. Maybe a part went loose because it does seem louder than it was before , like it sounds like little rocks moving around, but im pretty sure it did that noise before. i dont remember tbh . But I dont think the filter (fluval 306) because everything seems to be flowing in correctly, and the water comming out the output tube looks clear , not the yellowish brown that the rest of the water in my tank looks like. I did a bunch of research and I just assumed that it was a bacteria boom and to just wait it out , but my family keeps telling me its "mold" and I need to get a new filter or something, so i figured Id come here and see what you guys think. Thanks for any responses