Every 3 days isn't really great.Im watering once every 3 days til the pot weeps a little, the larger plant dictates when they get watered, the smaller one could go another day but i get lazy and do em both….
They displace about a gallon and a half every 3days
You should be lifting each pot to make sure it's bone dry before you feed.
And stop throwing some in the pots just because your doing the others.
Each one bone dry first or you will have issues.
Stay safe
Bill284