What should I do with my 15 gallon tank?

  I have a 15 gallon fish tank, and I was wondering what I should do with it? I have fish in it now but I was wondering what I could have in their besides fish? I want something besides fish. I could tank the fish out and have something else. Any suggestions ?????
shrimp??? a 15 gallon is perfect for a great shrimp colony ...
-1 SMALL turtle (I would say 1)

-Hamster

-Gerbils (You could probably have 2-3)

-Frogs



Think about somehow making your 15 gallon tank two leveled. Try cardboard with bedding on the bottom, bedding on the top and make a hold and put a tube or tubes leading up to the second level where you could put food and water. The bottom could be used with little houses or other accessories if you are leaning toward the "small rodent" category.
shrimp (ghost or bamboo), i know one petstore by me that sells large (5 ") domestic crayfish in different colors ( albino and red mostly) for aquariums and they are awsome but they eat small fish. also could do african dwarf frogs, snails, khuli loaches (not really a fish) so yeah there are a lot of options and all of these will fit in a 15 gallon tank.
You could keep some frogs! I would recomend a Pixie frog is good for begginers and has an entretaining appetite ... Also, less active and begginer-friendly, is a Pac-man, or, horned forg ... Another one ... (and cute, too!) Would be a White's tree frog, they dont move as much, but are neon green, wich is cool. pets question and answers,www.5d2d.com



Personally, I recomend the pixies.
Turtles