Hi welcome to the forum Are they gasping at the top or is it just in that photo?
Can you give us as much info as possible - eg tank size, tank mates, ammonia, nitrite, nitrate levels and have you added anything new to the tank or changed anything? New fish, plants, decor, food etc?
Are they any other angels and broad leaf plants in the tank? I've never done angels myself but my mom bred the things. Is it possible that the critter could be prego?