White bubbles on tank surface

[Linxel]

Had the same thing happen last month. Turned out my filter was due for a cleaning. Gonna sound weird, but have you added any new fish or plants recently? Sometimes they bring in extra organics.

That's a good point. New additions can throw things off. How long has the tank been set up?

[duskid]

I'd also look at your lighting. Too much light can cause algae blooms, which might contribute to the bubbles. How many hours a day are your lights on?