Girlofgod, thank you for catching my typo, yes, I meant cycling with angels would be inhumane.
I also don't agree with cycling any tank with mollies, either. Live bearing fish are not the best fish for cycling. They are prone to too many illnesses. When I said it needs to be done properly, that means fish that are known to be sturdy and healthy. Danios fall into this category, as do a few of the tetra species.
Star, my opinion at this point would be to break down and start over. Were this my tank, I would clean everything with a solution of 1 cup of bleach to 1/2 gallon of water. I would then rinse everything thoroughly, and let it all air dry for 48 - 72 hrs, then begin fresh. I would discard the gravel you borrowed to start this new tank, and also the filter media. Once done, I would fill the tank, add the water conditioner, and let the filter and heater run for 24 hrs, then add a fresh bacteria culture of gravel and/or filter media, maybe a decoration or 2 from the established tank, and 3 - 5 SMALL STURDY fish, such as danios. If you want a list of good fish to cycle with, give me an idea of what you plan to keep in the tank, and I will find you some options compatible with that, yet safe to cycle with. There are 2 products you could use to help you out, one is called "Cycle" the other is called "Biozyme". A daily dose of one of these bacteria starters for the first week, easy feeding of the starter fish, and monitoring your water quality should be all you need to do.
As for the jelly-like substance, this could be a number of things, and none of which I could imagine are healthy for your tank.
This is one of the many problems I have encountered with helping people do the "fishless cycle". Ammonia should be "pure", which isn't always easy to find. Other chemicals in the ammonia mixtures are not only highly toxic, but some will leave residue in the tank, some will cause funky growths, and many other potential hazards that can be expensive and difficult to clean up. The bleach water should help to eliminate any contaminants that are left behind from the ammonia solution. The important part of using the bleach water is to let everything air dry completely before setting it back up. Bleach is about the only chemical that will evaporate completely without leaving a toxic residue anywhere in your tank. After rinsing, you should not be able to smell bleach. If you smell bleach, rinse some more.
If you feel more comfortable with someone live to ask questions to, simply PM me here, and we'll set up a time to chat on Yahoo messenger. I will help all I can.
When I was still working at the store, I had many customers who came in and would deal with nobody but me. Many even refused the help of my manager. Why? Because I took the time to explain the things I instructed, and I stood by them through whatever it took to fix a problem. Those who listend to my advice claim to never have experienced the major problems that are so common these days, and many got hooked on the hobby quickly. I had a few regulars who used to just follow me around for hours at a time, listening to me teach those who needed help. I take my work very seriously. When I say I don't suggest the fishless cycling, I do so for very good reasons. As I stated before, I won't say its impossible, I don't feel anything is impossible if you try hard enough, but... is it really worth the problems and expense it can cause if it doesn't work? I try to always error on the side of caution, for the sake of the animals. I am not interested in helping someone abuse an animal, any animal. If I felt that cycling properly with fish was harmful to the animals, I'd be finding other ways to easily cycle the tank.
Your other option, of course, is the way I've done fishless cycling, using flake food. This, also, can be touchy, because you'll never quite know for sure how much is enough, and the risks of over-doing it are high. While I, myself, use this method, I'm not fond of teaching it. Also, cycling this way can take a bit longer, and most people don't have the patience that it requires to do it properly.
I will leave the call up to you, with or without fish... but either way, I extend the Yahoo chat invitation to help you do it without lost lives and wasted money.