Hello, can someone please tell me what the build up on the surface of my tank is, I'm pretty sure it's from the surface being way more stagnant due to a breeder box breaching the surface of the water. Also there is a thicker spot above my filter sponge and I think it's there because of the stuff on the surface being pushed toward the slits in the back of the tank because I had to lower the breeder box into the tank to let my clownfish back in allowing the water flowing back in to push it there. So is any of this a problem, am I correct, and does this need to be removed. Thank you for the help (pictures attached below).