How long should I watch for aggression in betta?

[LadyWang]

In the next week or so im wanting to try to put my male betta in my 15 gal tank with my 3 adf's how long should I watch to make sure that everything is ok? could he be fine at first and then in a day or week become aggressive? I just want to make sure that no one gets hurt and know the best way to try to introduce everyone. Any help is appreciated.

 

[shellyx]

You,ll need to keep a close eye on him for a while, my betta did fine for 6 months then he was badly beat up things can change quickly. Hope things work out for you

 

[shellyx]

Just realized it's frogs sorry too early in the morning for me lol just watch him & hopefully they,ll be fine. When I add anything to my bettas tank he usually let's me know straight away that he doesn't like them lol then it settles after a few days