I have had my GBTA's split 6 or 7 times. They generally show thier bubbles for about a week or two, then they go back looking like yours do. The only other time mine will show their bubbles is if I move them to a different tank with slightly different parameters sometimes they will show their bubbles for a while.
My sons GBTA's always show their bubbles and his do not grow nearly as larage as mine do. My largest is about 15 -18 inches in diameter.
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