white film

what is this on surface of water? i just did a water change yesterday

Alright, so I just did a 25% water change on my tank, which after refilling the tank levels, the water is higher than it was before. I noticed almost immediately there's this oily film forming on the surface. The fish don't seem to mind it, but I'm unsure what it could be or why it showed up...

I have one corydoras has been covered with white thin films for weeks., some lesions. Then, red belly developed. I have 55 gallon and other fish, some scaleless, who are/were till medications. Despite all these skin lesion, the Cory appears to be active and have healthy appetite. I started...

Hi there i need help! my glowlight tetras developed a white film over their body overnight. I also noticed that some have frayed fins and some are missing a chunk of their tail. They also havent ate in about 2 days now. Just couple days ago I started a new tank. Its been cycling fishless for...