Level 1: "Hot Coffee" for the tetra tank (embers & coffeebeans, eh? Would suggest "Starbuckles" as it would be great publicity when they sue you, but this is expensive PR.)
The mollies? "Unsinkable." (3 quatloos to the first person who identifies the reference here.
L. 2: "Mines of Moria" or "Khazad-Dum" for the rasboras. Cuz everything in there is dwarf.
And the crawdad tank? Howbout you change that to "Zydeco"? I find naming one's fishlife after food product to be...disconcerting.
Level 2 rasbora: Whichever name you didn't use for the Level 1 rasbora. It's still pretty heavy on the dwarves.
L2: the baddis pair? "Bad to the Bone"? And change the "Small World" name--a 10g is inherently small so no need to emphasize the fact to the customer unless you're trying to upsell. Besides, Disney is notoriously ferocious with lawsuits. How about "Book 'em Danio"? (2 quatloos for this ref, it's easy.)
I am out of names at this point but am thinking about how you could use this whole package concept for promotion. A customer comes in and says "I'm thinking about getting an aquarium, nothing too big, what would you recommend?"
You the LFS worker have your options wisely planned in advance, but describing them in words and waving of hands is inefficient. You need to find or make pictures of every tank named above.
People here who have the right combinations (or others) could volunteer their pics. And perhaps the store could set up a display tank with a nice but neutral substrate and plantings, and rotate the fish/inverts in and out on, say, a monthly basis. You could even put such materials on the store's website. What? You say they don't have a website? Quell horreur! You could help with this problem, no?
Or you could gather pics--really REALLY good pics--of each option and set them up on a Powerpoint or uTube video or even a paper flip-chart type thing. Kinda low-tech, but cheap. And it helps people visualize the reality of what they're dealing with.
While we're on that subject you could do some What Not to Do pics as well. Put a baby pleco in a 10g. It looks cute. Take pic. Replace baby plec with a <i>full grown</i> one. Take pic. (afterwards hastily putting big plec back in proper tank.) Point out to customer the difficulties this presents.
Same deal with 3 "cute little" goldfish in a 10g. Use white sand substrate and cover it with mulm to demonstrate the unfortunate side effects of goldfish ownership. Pic 2 again is goldfish a few years later. I'm sure other possibilities of Unfortunate Fish Choices will occur to you.
Fun project. Thanks for posting.