If the fish youre getting are all 1" long then yes.
Most generic common tropical fish are 1.75-2.75" long, and theres many that get well near 2ft (probably longer in some cases but i dont personally know of any, but im new so...)
what fish will you be getting?
I mean neon tetras are a nice beginner fish, and theyre a good 1.5" in average cases, so you could have 15 ish of them at most.
Youre probably looking at 10 fish, considering a lot are 2" ish.
slight Overstocking of fish isnt terribly important with certain species that are slow moving and care little for space and spend most of there time hiding in cave structures or under bogwood plant areas, but with shoaling fish they need loads of room, they like to swim around with plenty of room, and if you have 2 different types of fish and have little room or are overstocked then theyl get a bit stressed possibly, again, depends on the actual fish.