strange bubbles in tank

[shellyx]

Hi, looking for advice recently set up a new tank for my betta he was getting bullied in my large tank, after cleaning it out yesterday & adding new plants I,ve noticed air bubbles covering the whole of my water line these start to disappear when I lift the lid? The filter I have has a spray bar which hangs out the water is it this? Do I need to worry? The tank is 25litre, no sign of any paras at the moment seeded the tank with ornaments etc from my matured tank. Any advice would be great.

 

[BettaTony]

Male bettas make bubble nests. That's where they keep their eggs, this usual means that your Betta is ready to breed

 

[shellyx]

Thanks, It's not his bubble nest, when the filter is switched off bubbles are rising from my live plants, think It's the spray bar creating lots of oxygen It's settled down a bit so just keeping an eye on it.