brown patches are in my tank all over the place its like a thin layer of algea which easy rubs off, does anyone know what it is and how to get rid of..most of it is on the gravel but is hard to see, u can notice it more of the filter pipe and my no fishing sign and my plants
if needed i can post pictures
my tank 4ft
filter fluvel 404
fish
2 small tench
1 gungeton
1 barbal
2 rudd
all fish are small
if needed i can post pictures
my tank 4ft
filter fluvel 404
fish
2 small tench
1 gungeton
1 barbal
2 rudd
all fish are small