a nice tank makes selling the fish in the first place easier.
even if its a few fake plants or so (easy to move) I focus on making my fish happy and healthy, that way they sell quicker and the people come back to buy more.
my motto is "im not here to sell you your first tank, im here to sell you your second and third." happy fish = happy fish keeper.
I'd hire you if I could. nice attitude, now drop the judgmental side and work on fixing.
btw... if you want a good reference for the pet industry, do some volunteer hours at the local SPCA.
and seriously, 19yr old, living at home in one of the best student cities in the world, do some study instead.