LOL!
No, the display is fine and looks quite nice actually.
I meant whose job is it to clean alagae from the inside?
It would seem using your hand is pretty well out of the question, and it's concievable that these two might attack long handled scrapers or magnetic algae removing pads.
I've had or worked with animals where just cleaning the cage was an experience that warranted hazardous duty pay!
Here's another photo for you, but this guy is a Wuss compared to your two...I'm not even sure what it is.
We caught it at about 10" and it's now around 2 feet and appears to still be growing.
The surprising part is, like all eels, it's sight just isn't that good and it often grabs my finger by mistake, but freezes the second it knows that's me.
Then, very gently, it moves it's head up and down, test nibbling, until it's SURE that it's found food, then WHAM!
It rips it right out of my fingers.
That's WAY smarter than anything I ever expected out of a fish.