Just the kind of sage advice I was hoping for
I've been racking my brain trying to guess at so much, such as...I know the formula for buying used tanks (generally $1/G if in good shape, 50-cents/ G if in not-so-good shape,) but it just feels like guesswork trying to estimate & get a handle on buying-used prices (if I can ever figure it out, somehow, I'm going to poll a lot of wise people like yourself, folks on Badmans, Pleco Fanatics, stores and maybe even some of the nano tank greats *and then write an article* and submit it to anyone who'll run with it just so other's aren't stuck in the same prediciment---lol, but true! Just as soon as I can get it all together : ) )

LOL, I've been trying to do story problems as convoluted as this, no kidding:
"If a similar stand and canopy might sell new today for roughly $300, and the man who has it now bought it from someone second-hand, and it's 10 years old, and it has scratches across the front, and now he wants to sell it to me second-hand once again...then what would a reasonable price be given it's condition (and other things packaged with it?) Besides, how solid is a 10 year old stand for a 55 G tank?" (The seller kept telling me the set-up's worth the $200 alone based on the 3 year old Eheim--how fast *do* Eheims depreciate? And would the deal have been worth it were it a 75 and not the 55 G tank?)
It's been maddening
Here's the thing, though...Do you think, by it's measurements, that it is a true 75 G? (Also, I've tried doing the math on the lighting new--could it honestly be worth close to $1,000 new? I'm just trying to make sure it offsets the future canister filter purchase cost...that was my initial hope, just finding a good little canister filter

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And...(the kickers)...

...I need a system that, seriously, I only clean 3-4 times/year (that's the whole reason for buying larger--my health's exhausting. It honestly takes me about 5-6 hours to clean a 20L with just one fish in it. I know, it sounds ridiculous, but it's been this way for a year or more and with the allergy + I.V.s + wicked RA treatment that'll lower my immunity, I *really* need a set-up that'll fit the bill. Can this be accomplished with a very low bioload and 1 (or 2) HOB filters, or would I really need a canister to get those kinds of results? (Filters I have on hand at present are two Aquaclear 70s--300gph and an Aquaclear for a 10 G (and some messed up looking Penguin filters.)

...Speaking of bioload...the cats, tetra, platys, guppy that come with the tank--really, no problem; white clouds and danio--a bit higher producers of ammonia and waste. Essentially, though, this is Minnie's tank and I'd really like to add a few bn plecos in for her to schoal with. What number of fish would you suggest--both in bn plecos and overall--to keep the bioload to a pretty serious, low-maintenance minimum--cleaning only 3-4 times/year (that's the big one)? Also, speaking of cats and territory, do you have any suggetions re: number or bn plecos (or other cats,) even regarding ratio of males to females? And, a little off subject, should I consider providing a part of the tank that has sand? (I forget if I've asked that one before.) Oh, also (and I'm guessing this one's a stretch...) but can you think of any fish--particularly cats--that are super-friendly, come to the glass to see you, etc.? I really miss that (it's one thing to have mostly nocturnal fish, but I do miss a friendly/appreciative waggle.)

...Also, as this tank will be in the sunniest room in the house, should part of it be shaded (besides the usual tubes/furniture?)

...There's also the possibility of new carpeting in the house coming this Fall and I don't want *any* possibility of screwing it up from an aquarium on my shoulders. Can anyone think of some fail-safes to put into place?

...For water changes, would you still go siphon and buckets? (If so, I'm thinking of getting a small second-hand kids' wagon to help me out, lol.)

...Now, for the dumbest question of them all: I've only ever had fluorescent lights for the tanks. I've heard big, good things about metal halides, but they've always been so out of my reach that I really haven't looked into them. What's their appeal and are they expensive to upkeep?
One more giant question, I promise
Is there anything you can think of that, should I see it when I go to look at this tank, I should just say thank you and politely walk away (warning signs, etc.?)
I'm really so glad to know about the 75 vs the 55. Another ad was for a 55 with an open-style, one-shelf stand that the owner is getting a brand-new replacement Marineland Magnum 350 for. *Any* kind of canister sounds nice right now, I hope you can understand...I'm just trying to make sure that the trade-off for the larger 75 G will keep the tank as clean (for as long) as a 55 with a canister. (Crazy, I know, but so very much appreciated

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I just made nice, moist, chocolate chip cookies the night before last and wish I could send you guys some-You
more than deserve them!
I promise, once this whole thing's done and together, you guys are getting the first pics!
