Robynleigh
Aquarium Advice Freak
I have an old HOB filter sitting around - it's filthy... Any tips on what I can use to clean it?? Was thinking vinegar? But don't want to hurt my babies ;p any advice is great.. (By filthy - I mean really bad!!)
If you really must clean it, keep the filter media, specifically the bio media, wet and safe so that you can return it to the filter when youre done cleaning it. Otherwise you will have killed off all your beneficial bacteria, and your ammonia level in the tank will spike, harming the fish.
This is for an old filter that has been sitting around and the OP wants to prep it for use. Otherwise your advice is spot on.
Reading is fundamental. .....thanks