Wow, great video!
Haha, I can't believe that naso survived in the overflow for that long ! What was it eating? And is he back in the DT now?
He ate whatever came his way I suppose. He went missing and I looked all over for him, on the floor and yes in the overflows. Musta missed him. One day I was looking down on the tank from above, and I saw him in the overflow. I looked up in my records when he had gone missing and it had been 6 months! The overflow is maybe 8"X5" and has pipes in it, and the fish was 4-5 inches, so he didn't have very much room for a long time. It was very hard catching him in the overflow, but he was immediately put in the DT and is doing great. I was so happy to find him! I had gone through several Nasos which died mysteriously, I believe due to cyanide. The two I have now are healthy, growing and doing great. The larger is just beginning to grow streamers on his tail.
The smaller was the one in the overflow:



