I think a black tank, with black pipes, and a UV light, would be great. Here is our previous Blue Ribbon Eel videos; lived 6 years:
https://www.youtube.com/watch?v=8MrGTlqcbNw
https://www.youtube.com/watch?v=oZ8wqhE4vL0
https://www.youtube.com/watch?v=HJDT6xSxX_c
https://www.youtube.com/watch?v=5qVOnLdz2n8
https://www.youtube.com/watch?v=JAYoyHwoh20
https://www.youtube.com/watch?v=9OkkULM8fUo
https://www.youtube.com/watch?v=Z-czlAYmvzM
https://www.youtube.com/watch?v=HLi5-GBRMNk
https://www.youtube.com/watch?v=E1s9DagZzW8
https://www.youtube.com/watch?v=f7aWtixmND8
https://www.youtube.com/watch?v=9Kk3vAN1Y3g
https://www.youtube.com/watch?v=ynxAlnvgy5w
https://www.youtube.com/watch?v=hVZQxwPxtQk
https://www.youtube.com/watch?v=Y36Gow8WANQ
https://www.youtube.com/watch?v=Qz2oOZlWHts
https://www.youtube.com/watch?v=1u1MMkTD1ts
https://www.youtube.com/watch?v=b4UKICoLwwI
https://www.youtube.com/watch?v=ad9KTIfYmaw