PLEASE, don't do that to your plant. The venus flytrap is a great plant, but like chameleons it needs special conditions. Your idea is like keeping a chameleon in a pond!
First of all the V.F. (Dionaea muscipula) is a US native plant, it is not a tropical plant!!! It needs sunlight, direct unfiltered sunlight, even strong sun. It then needs a winter rest where the temp must reach nearly freezing. After that it needs pure sphagnum moss as a substrate and you have to water it ALWAYS with demineralised water or rain water!!! In a chameleon cage it leaves would be always closed because they would be touched by the cham and besides that it WON"T EAT GNATS! This plant doesn't need to be fed, it can take one fly in a week and it will be allright.
Now, you have many great resorces on the net and I think you should have taken a look before buying it...I know it might be cheap but it is still a pity to destroy it. So, remember this, for a happy venus you need:
1. Direct sunlight
2. Rain water
3. Pure sphagnum moss as compost, no fertilizers added
4. The most important thing is that the water must stand ALWAYS under the plant so it can be constantly wet, becouse its a wetland plant!
If you follow these instructions you will have a happy plant, if not it will die very soon. I have many and they are simply great...
All the best
Filip