Here's my two cents:
Cleanup crews are still advantageous in an eel tank. Eels take awhile to find all those little goodies. I always use a cleanup crew in the eel tank (usually a 50 pak), and the critters last a good 6 months. That's just me, I don't mind losing the snails and crabs eventually, because they are so good at keeping algae and detrius at bay.
As for UV, UV is great for hair algae. I do use one in my eel tank, but they are not necessary in an eel tank if you are good about water changes and have a killer protein skimmer (which I recommend!).
As for Goldentails--in my opinion, they are some of the coolest looking eels out there. They are said to grow to a slightly less-thick diameter than an SFE and don't get quite as long. However, they are aggressive right away, unlike the SFE, which "grows" into its aggression.
OH yeah...don't put your eel tank in your bedroom...they are NOISY rockmovers!
BTW, if there is anyone who knows where I can get a LARGE SFE, let me know. I would love to have another one, but it must be large enough to swim with the big boys in my eel tank.
FalconSki--I once had a porky in with my Blackedge, and he would puff up all the time when the eel got near him! It happened too often, though...and ultimately, I returned him to the LFS>