Bubbles or eggs? (Photo)

[Clumpy138]

Hello, in the photographs attached are some "bubbles" that have appeared in my tropical tank.

I am not sure however if they are bubbles, or eggs.

I have researched about the two but would much appreciate people who have seen eggs to share their opinion !

Additional information:
- Fish: 2 blue gouramis, 2 'kissing gouramis', one Siamese fighting fish and 6 neon tetras.
- The two kissing gouramis are fairly new to the tank (bought a week ago)
- The bubbles are only at the top of the tank.
- Established tank (had for around 6 years).

Any help, opinions or words of wisdom would be greatly appreciated!

Thanks,
Sophie xo

 

[Joeysdiscus]

Your betta has built a bubble nest research bubble nest my friend

 

[Clumpy138]

Apologies only uploaded one picture ! Here is the other!

Sophie xo

 

[Clumpy138]

Your betta has built a bubble nest research bubble nest my friend

Thank you - that may explain why he has been guarding it all day!