So, 25 feet would prob be great. But now I realize I will have to concern myself with how I will connect the hose to my bottle and then getting a regulator for it.
So, pick up a 25' hose from Leisure Pro (or I'll grab one from my LDS and carry it to you, but you pay shipping
). Then all you have to do is grab two small crescent wrenches and swap the hose with one of your normal hoses when you want to do the work.
Of course, after a few dozen times, you'll get tired of swapping the hoses (which isn't hard or anything, but it's a pain, and you'll wonder if you're wearing the threads or something expensive). Then you'll go find a cheap regulator to use for your aquarium rig.
Of course, if I were you (which I'm not), I'd just go to Leisure Pro and buy the cheapest reg they have ($125) and a 25' hose (almost as much). That would then become my "aquarium kit", with the 25' hose permanently attached. I would rinse the second stage after every dive, of course, but other than that, I wouldn't even bother servicing it. Simply put, having a regulator fail while you're in a little aquarium like that is no big deal, so I wouldn't care that it wasn't going to be serviced regularly. It'd probably last for years, and if it ever fails (free-flowing or whatever), you can get it serviced or replaced then (whatever's cheapest).
Of course, before I bought one from Leisure Pro, I'd *definitely* call the guys over at ScubaToys (ScubaToys.com for the number) to explain what I want ("I need the dirt-cheapiest reg you have and a 25' hose, because I want to use it just to clean this aquarium. I'm not even going to want to pay for service on it until I've literally run it into the ground, since it can fail on me and it'll be nothing worse than a slight annoyance. What would you suggest, and how cheap can you be?"). They have a habit of excellent service and intelligent assistance, and I don't think even that situation would throw them, and they might have something sitting around under a bench that they can sell you for dirt and a fish photo. :biggrin:
(Incidentally, I wouldn't want to use a reg that I didn't know, since the second stage could be internally damaged or whatever, but I *would* feel completely comfortable using an almost-never-serviced personal reg for such a task. Check the intermediate pressure with a little gauge every few months, and unscrew the purge cover to make sure nothing's rusting through. My cats could do that much, except for the claws.)
