75 gallon, aquaclear 110. I just did a big water change(75%) Half way through filling up the tank, i realized i forgot to fill up my filter with tank water. So i just filled it with tank water quickly while my aquarium was filling, so some tap water went into my filter also. I did use prime before i started filling, I also put some right into the filter after i put the tank water in. Do you guys think my BB will be fine? Also there seems to be lots of bubbles sticking together at the top of my water, ive seen it before but not THIS much.. any idea what it is? Is it harmful?