| | Re: Brown water in filter
Brown is normal. Poop, bacteria, food, algae, biofilm, etc. all of the organics in the tank end up becoming detritus which settles in your substrate or gets sucked into the filter. If you clean your substrate you should notice the same brown organic matter.
To be clear, detritus should be a light-medium brown. If it's a dark brown that's something else (algae or other). It should also be flaky and small particles kinda like disintegrated toilet paper. Hope that clears things up