Did you add any kind of nutrient at the beginning? If not, then yes, add some. Those yeast are probably a little malnourished right now & could use a good multi-vitamin.
That's actually pretty impressive how far it went in a few days with nothing added.
Oh, & bubbling does not necessarily mean anything.
"EC-1118 is a monster yeast. But it is also clean and quick. Like a humane serial killer."
1 Gal: Traditional Wildflower Mead
1 Gal: Backyard Grape Wine
2 Gal: Juniper Braggot
Bottled: DIIIPA, Raspberry Melomel, Rhubarb Melomel, Oktoberfest, Barley Bracket
Kegged: Oktoberfest, ESB