[Foam Bubbles on surface of water.]

Thank you guys so much! Now I can relax.

[Foam Bubbles on surface of water.]

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

[Foam Bubbles on surface of water.]

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?

[Hello!!!]

Hello, I'm Chey and I'm from northern California. I'm only 22 and have been a fish hobbyist for just under a year. I have a big community guppy tank with black loaches and African dwarf frogs. And then I have a African cichlid tank and a Betta tank that I rescued. Ignore all the algae on the ciclid tank I accidentally missed a mystery snail nest and now I have 50 baby mystery snails in there so I left the algae for them.