Hard to tell without a good look at the base.
It could well be a BTA (Entacmaea quadricolor if you're into Latin names). I don't think you'll find LTA's (Macrodactyla doreensis) with a bulge like that in the tentacles.
The "bubble tip" tentacles in BTA's tend to come and go in captivity. It's not really known why or how, it just happens. I find mine will usually come back after a split but then eventually go back to long and stringy.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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