Film in tank

[InfiniteGlory]

there is a film on the top of my water and I can't seem to get rid of it. I noticed it two nights ago right before a 50% WC. I thought the WC would get rid of it..... I looked tonight and it is still there. Here is a list of contents

7 snails, pond and ramshorn
anacharis
moneywort
compact sword
anubias
seachem ammonia alert
heater
HOB filter with fluval sponge material and bio wheel

[tekkguy]

It's just extra protein on the top of the water, most likely. Looks a little like an oil slick? Just skim it off - it's harmless.

[InfiniteGlory]

yes, just like an oil slick. what is the best method of skimming it off?

[Kwomais]

I just drag a paper towel across the top of the water.

[waterdog]

I use a small cup and skim it off

[taylermckee]

One of my fish tanks gets this film too. Is there any way to prevent it? Mine keeps re-appearing even after 100% water changes. It is a 1.5 gallon and the only thing in it is one betta and some silk plants with a small heater.

[tekkguy]

Surface agitation will help. The extra protein will still be there, but it won't be a scum on the surface.

Unfortunately, an airstone wouldn't be a good idea for a betta in a 1.5 gal most likely. You could cut the tip off of a bamboo chopstick and stick your air hose on it (pointed side out), and use that instead of an airstone. You'll get finer bubbles and some surface agitation that probably won't bother your betta too much.