I just got one of those Tetre Whisper filters for my 2.5g (the one that is made for a 3g) and when the water is pouring out of the top (which is above the water like the instructions say to) there is also bubbles coming out.
I'm really confused by this. When I first got the tank I didn't wash it with soap, I used vinegar, so there should be absolutely no soap bubbles in the tank. I rinsed out the filter and the Bio-bag before placing it in the tank.
If you lift up the lid the bubbles are coming from behind the bio-bag (not the side closest to where the water pours out). There is also now some bubbles lining the side of the tank (not made by my betta).
The bubbles don't look like they are soap bubbles, but I don't know. What are these bubbles and how do I get them to stop?