Love the clown knife. How big is he? I had to get rid of two, 21" and 9", about 8 months ago when I moved. My favorite fish of all time. I now have a 4" clown and 2 6-7" ghost knives.
Oh it is super cramped, going for 4' wide tank soon. (Had him in a 7' x 4' wide indoor pond but I moved so back in the 8x2 he went, gonna make something new soon)
I have fluorescent lights on one end of the 8' tank but the other end just has white low power leds. The Niger catfish does not like bright light, so I keep one end dim for him.