Can anyone identify what this is?

[ScubaGirl]

We have a couple of spots of what looks like jelly-like packets of what, we don't know. The are white with some opaque, some transparent areas. They have not grown or changed since we got the tank 2 months ago. Just curious what they may be. I have tried taking a pic with not great luck but here it is. There is a couple of these spots right in the middle of the shot.