Fishbros

I forgot to mention that, it is aquarium sand. I have the caribsea super natural put in the tanks. I am trying to work out my issues with the filter currently I am trying to figure out the best configuration for that tank. Thank you for the help with that

I vacuum my tank at least once a week. And the sand was washed very well and has been in there for months now. It all started shortly after I changed to this sand to. I have not thought of that I can look into that. It's hard to see in the picture but it has a slight whiteness to it nothing thick though.

I have a 75 gallon tank that is running a fluval 407 filter as well as a aquarium coop large sponge filter. I have also added a pre filter sponge on the outside of the fluval intake. I am having issues with the water being rather cloudy. I have some pretty fine sand and several corys and I am thinking that the water might be cloudy with sand particles from them. I have reduced feeding for the last few weeks and have not seen a change. I tested my water with an API test kit and everything is zero except Nitrate with is 5ppm. I do weekly and sometimes biweekly water changes and that helps for a little. I have added some poly fill this week to see if that helps with no luck. I cleaned my filter last week we tank water thinking it might be something stuck and preventing it from doing its job and no change. I am out of ideas, what do you guys think?