Here's another photo and yeah, I know, i think I would have to fill the tank to the very top to get him enough room which I don't love the idea of..Can we get a better picture of the overflow? Do you have enough room to fill the tank to the rim without overflowing the tank? It's risky to do, I know, but can work if there's around an inch for the clown to swim out.
There's a member here @Dsnakes, that had the same problem with a clown in their overflow, but they had the removable panel. They removed the panel and closed off their drains. Filled the tank up to the rim and the clown swam out.
Anything else just really doesn't seem doable
I may try to net him tonight while he's asleep if he's at the top. Maybe I can get the net under him before he realizes what's happening but I kinda doubt it



