armydad
New Member
Why am I getting this redish brown film on the glass, its also on the sand. It comes right off and in a fews hours its back I do weekly 10% water changes I tested the water and its no differant than its been in the last 6 mo. I have used water from a machine for several years thats been serviced weekly. This tank is over 3yrs old and ive never seen this stuff as bad.
