I'm using maracyn 2 treatment on my betta (powder)...PLEASE HELP :?

Question

once i put it on the surface it began dissolving instantly but then...

my betta, thinking it to be food, put some in it's mouth. :S

Is this harmful, i think it spit most of it out, but i don't know...

Answer 1

it's fine not a problem at all

you will also see foam forming on the water surface which he will most likely try to eat as well

it will only help with the treatment, as he will get it directly into his system

Answer 2

Your betta should be fine.  Next time, dissolve the powder in some tank water before you pour it in the fish tank.