Jeez....Why not just beat the poor kids dreams into the mud.....I thought that we were here to help? She is looking for help! How many of us have done something to fish that we did not know was wrong?
Keeping fish CAN be expensive. My 55 gal. tank cost me $50. Came with all equipment, and like 100 Lbs of gravel. If you are on a limited budget, buy used. Makes things sooooooo much cheaper! My 20 L that I am setting up has cost me just over $200 so far, and I have not bought most of the equipment yet.
Back to the topic!
A 10 gal. tank will work for a while with the goldfish. I would think that the ADF, and shrimp would be ok in there also. However, if you would like to keep using the hex. tank, you could put the shrimp in there all by themselves. Most shrimp will show off more, and be less stressed when there are no predators around. I think that you would enjoy the shrimp better if they had their own tank(this coming from a person who is setting up a 20 L tank for shrimp...). I would also check your local papers and such, ask around, look for used tanks/equipment. It is definately cheaper. Who knows, you may find someone who is willing to give their stuff away. Free stuff is always cool! :dance