In a 2.5 Gal with a Betta and ADF... i'd say it depends on how aggressive your Betta is. Some are known to attack the not-so-good-for-sight ADF, for no reason at all. Or some won't tolerate them whatsoever.
I'd also second that someone above said and get a bigger tank, i think a 5GAL would be fine for a Betta and a pair of ADF's, because they do like to be in pairs, they are very social animals, and it's fun watching them communicate. 
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In my dreams I’m dying all the time, As I wake it’s kaleidoscopic mind, I never meant to hurt you, I never meant to lie, So this is goodbye, This is goodbye, Tell the truth you never wanted me, Tell me, In my dreams I’m jealous all the time, As I wake I’m going out of my mind, Going out of my mind... ♥
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