Daniel, thinking back on your first post, if you started your tank off with gravel from an established tank, it should have had bacteria in it that would have jump started your cycle, IF you kept it moist from the tank you used it from, AND if you continued to "feed" the bacteria once you put it into your tank.
I think this may have been part of the problem, because if you ran your tank for two weeks without any fish in it, or without putting fish food in it, most of the bacteria could have died.
Sounds like things are going better now though. Are you taking a reading for ammonia? I didn't see any results for that.
Once ammonia and nitrite both are reading 0 and nitrates around 10 your tank will be cycled, and you can just do the once a week 25% change. Glad your fish are looking better....
