I just noticed some streaks inside my 29G fresh water tank, they kinda look like snail trails or fungus you would find under a log. All of my fish seem healthy and no one new has been added. It's a heavily planted tank so salt is a no-no. The tank houses 6 Black Skirt Tetras, 4 Bumble Bee Gobys, 2 Red Fin Black Cats, 1 Clown Plecostemos, 3 Adult Platys & 3 Baby Platies (there were 30 until someone got hungry) Can anyone help me?
San Marcos, CA