lately i have had a problem with my pre filter for my hob filter that i have.
after a day or 2 it will end up getting clogged up with brown algae. (i am assuming it is brown algae because when i squeeze it in a bucket of water. the water turns brown. i could be wrong.)
this just recently started happening. i don't know what I'm doing wrong so if anyone has any ideas and advice please let me know!