Foam Bubbles on surface of water.

[Chey]

I have foam Bubbles on the surface of my 5 gallon fish tank. I just did a gravel vacuum and 50% water change. I used my master test kit before the water change and also three days later. Water Quality is all good so what could be wrong. And yes I used Prime water conditioner. I'm only 8 months into this hobby. I have one Betta fish and one snail in this tank. The tank is six months old. I have other larger tanks that are not having this issue. I also serviced the pumps by wringing out the dirty filter in the aquarium water I vacuumed out. The bubbles appeared three days after tank maintenance. 

Any Advice?

[Cory]

Any chance your male  betta is building a bubble nest? 

[Frost]

Sounds to me like your Betta likes the tank and made a bubble nest

Edited July 17, 2020 by Frost

[Chey]

I didn't know they made bubble nest! How interesting.

[Frost]

Yeah, when they spawn the male will keep the eggs up in the bubbles until the fry become freeswimming

You can see it as a way of him saying he likes the tank and has claimed it as his territory, and to keep up the good work

[Chey]

Thank you guys so much! Now I can relax.

[KaitieG]

Sounds like the best reason for foam ever!