Originally Posted by latriana465
From the pictures it doesn't look like fin rot, just the tail coloring. But I would keep an eye on the tail to make sure he doesn't develop fin rot.
As for the filter, I am not completely sure but I have heard like you, that you can rinse the filter in tank water. I have heard people put some tank water in a bucket and rinsing the filter in the bucket so everything doesn't get cycled on the filter again and that the filter isn't replaced until its falling apart. Please do not quote me on this because it is only hear-say. How about starting up a new thread post about it. I am actually curious to know this answer too.
Yeah I know it's not rot and he should be fine since his tank is kept clean.
But that is a good question to ask! I have heard the exact same thing you said but I'll post something soon to make sure before I do anything