Update:
After doing a 70% water change and putting the correct dosages of Pimafix and Melafix, the fish were doing much better yesterday. Most of the whitish film that was covering them fell off and they look a lot better, and i even got a chance to feed them last night. The loach seems to be fairing well, it no longer has the white film layer covering it, and finally is able to sink (before it kept floating and hanging lifelessly near the surface, now it can relax on the bottom.)
Unfortunately, after coming home from school (i forgot to check progress this morning before leaving) the whitish film layer came back, and the comets looked like crap again, what the hecks going on?!? the loach looked fine though, it wasn't floating to the top again, just sitting there on the bottom, but the fish really didn't look good, slightly better than what i saw for the first time yesterday.
Looks like im going to have to do those 50% water changes daily like one of you suggested, but i just added the medicine before checking here (stupid thing to do....) so i think later tonight i will get on it. Will the water changes as well as the medicines work in getting rid of the bad bacteria or at least under control? i don't want to see them get better then get worse everyday.
thank you for your help so far.