I was feeding my babies today and noticed a strange film all on the top of the water.

I took out my skimmer and scooped it all out. It has kind of a gelatin feel to it. It looks white and stringy.

All the water parameters are within range. I did a water test last week. nitrates are a little high, I plan on doing a water change this weekend.

Any advice on what this could be? Any help would be appreciated!