Well, there's your answer. The seam picture screamed diy or inexperienced assembly to me. It looked clear for the most part, but not professional.
Just keep an eye on Craigslist. Check it a few times a day for new ads and be ready to pounce on something good. A few pieces of advice when searching:
- do a search for "aquarium" and "fish tank"
- sort the results by newest first
- be patient in searching through the results
This is what I did when searching for my tank. People list their items under "fish tank" and "aquarium" so if you search for just one, you will miss the other. If you sort by "newest first" then you can just check the results down to the last spot you saw in the previous search. If you search for a specific size then you are limited to results for just that size and you will miss results that are similar but not exact.
Hope this helps and good luck!