Are you testing the water with test strips or liquid test kits? Strips can give very inaccurate readings.
How did you cycle the tank for a week? "Fishlesss cycling" (where you maintain 2-5ppm of ammonia) would normally take 30+ days, my gut feeling from the information supplied so far is you are in a "fish in cycling" situation, which involves ~50% water changes every couple of days and being ready to do massive (~95%) changes if bad daily test results are obtained from a liquid test kit.
What are these "Eel Loach" and "algae eater" you bought recently? Pangio doriae and Gyrinocheilus aymonieri? The latter grows far too big (~40cm) for your tank and need well chosen tankmates, they tend to rasp on the flanks of tankmates. I worry your "Eel Loach" might be a Weather Loach, which again grow far too big (~25cm) for your tank and need 5-foot tanks with at least 5 "friends" (they are very social creatures). The sooner you can get photos of these two fish and upload them to a site like Imageshack to them embed them in this thread, the better.
An established 10g tank is only suitable for a handful of fish that stay small even when adult size, for example 5 or 6 male Guppies. Small volume tanks can very quickly turn into a toxic soup, as there is so little water to dilute ammonia and nitrite.
In the meantime, I would personally do a ~95% water change ASAP, removing all but enough water to cover the fish on the tank floor and then replacing with similar temp dechlorinated water.