Hi all, I'm still relatively new to the hobby so I apologize if this is a stupid question, but I'm having some issues with my filter. I recently switched from a canister filter to a penguin 350 bio-wheel for my 60 gallon tank and this strange mold/slime stuff keeps growing all over it slowing the filtration. I've been cleaning it off regularly but it's growing very rapidly. I held off on cleaning it for 2 weeks so that I could get picture to put on here. My LFS didn't have a solution to the issue and tested my water and said everything was great.
If anyone has any advice on what this is or how to prevent it, I would greatly appreciate it.
If anyone has any advice on what this is or how to prevent it, I would greatly appreciate it.