dwarfgourami
Fish Connoisseur
thank you all for your help with this problem. i appreciate it greatly and i am not ignoring all of your suggestions to return the fish on purpose. if i could bring him back i would but the place where i bought him from will not take him. i do not know any other place to take him or have a friend that would want him. when he gets to a big enough size i am going to move him to a bigger tank. i would never kill this fish on purpose by leaving him in a tank that will be too small for him. i will not let him grow to full size and leave him in there because that is just cruel.
For the reasons I explained to you in my post, it is already very stressful for him to be where he is and all on his own. He is quite likely to succumb to infection and die prematurely, simply from stress. Remember these are fish that should live for quite a few years. Not wishing to underrate your experience, but as you are not very familiar with giant danios and their needs, are you sure you would recognise when he was too big for the tank? These are fish with far higher swimming needs than your average beginner's fish.
Have you asked the store if they will take him for free? If they knew the size of your tank when they sold him to you, you could put it firmly to them that they have mis-sold you this fish and it is their responsibility to help you now. If you get absolutely no joy, advertise him for rehoming on this forum; if you don't find anyone here, try other fish forums, and there are special site for selling/giving away fish both in the US (aquabid) and in the UK (aquarist classified)
Or can we tempt you into that bigger tank? (nothing we like so much on this forum as corrupting other people

I hope TerraDreamer's response has not put you off listening to the rest of us; it is unfortunate that some posters express themselves in such an abrupt manner. However, I don't think any of us disagree with his *assessment* of what is good for the fish; we would just like to see it phrased differently.