I'm not sure if this is in the right topic, but anyways, recently I've noticed the aquarium walls in my goldfish aquarium have become foggy. When I put my hand on the inside and rub the wall it is slimey but also has a sort of coarse texture, but the film comes off when I rub it.Does anyone have any idea what this? I dont have any water testing kits, i'm getting them now cause I'm a bit worried. Although I've had this aquarium for awhile and never had problems. I'm stumped

i think the slime is bacteria building up. correct me if im wrong guys.

I don't think it's anything to worry about. I clean off the front wall of my goldie tank with each partial water change. I leave the sides and back alone.

Do get a test kit. You really need one to make sure their water stays happy.