Quote Originally Posted by areias
Is it a bunch of little bubbles together? Is it his "bubble nest"? Male bettas blow bubble nests, they house the females eggs. Do you have any test strips that you can test with?

Aqua safe is perfectly fine.
Thats' exactly what I thought

He should be fine! Just make sure the new water is the same temperature and about the same pH balance of his old water so he adjusts to the water change very easily and without a problem!