Yeah he does not appear to see you.. IDK about that one.. There's a little response after he jumps at the tank lid closing so maybe he's just feeling too poopy to react to you.. hopefully it clears up..
Does your CT have white whispy stuff coming off his rays like it appears he does? It's hard to tell with the video size and quality. If so, I think he's shedding his slime coat.. seriously get him out of the tank into new water..
ETA: I did a google search and it looks like the Tetra Whisper filters have carbon bag options. Supposedly there are three cartridges? Carbon will only work 1 week to a month and after that it will start leaching back into the tank whatever it took out.. http://www.petco.com/product/107131/...on-System.aspx
So it looks like the sponge or whatever you only have to replace 6 months to a year, and that's where most of your bacteria is growing. Then it has a dual sided pad with carbon? That should be replaced monthly and never replace the sponge and carbon in the same month. I'd replace the carbon at this point. Does that sound right? I'm trying to go off what I'm reading online and limited photos..
When the Timestrip® in the filtration system's hood has turned completely red, it is time to change your filter. Note: It is important to change your filter cartridge when the Timestrip® indicates because the carbon in the cartridge has reached its capacity for removing toxins.