I do a 50% water change once a week. And it might be a little much to remove manually. Any ideas what it is?
Hello again knut...
The more I look at the picture, the more I think this might be a type of moss. Moss growth looks like green sticks, very similar to the plant in the picture. Whatever, it must feed on extra dissolved nutrients in the water.
If you can't remove the stuff manually, then ease back on either feeding the fish or dosing the fertilizer. One or both should slow the growth of this stuff.
B