Filter that is airating the water? Are you breeding him or something? If not, not sure why you posted in the breeding section lol. If it is bubbles that are stuck together than it is a bubble nest.
If you don't give him a styro or indian almond leaf to build the nest under, it is not unusual to have bubbles kinda all over the place.I wasnt quite sure where else to post it. And no, he is just store bought. I am planning on some breeding, but not soon. I still have plenty I want to learn before I start. Trying to understand genetics at the moment. And I want to buy a good Breeder Halfmoon pair. Was only curious so I can make note of my observation. They are allll stuck together. from halfway down one side, the 90 degree corner, and halway down the next side.