08-20-2012, 05:59 PM
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I'm not sure where the nitrite is coming from. Ammonia can inhibit Nitrospira bacteria (the ones that handle nitrite) but ammonia is zero. I would continue with the alternate day water changes using Prime as previous members suggested, until this nitrite is zero.
Some live plants would not hurt, something simple like stem plants or floating. This would (or should) get the biology settled faster.
Keep feedings minimal, once a day is plenty, and not too much. Missing a day (like water change days) won't hurt as well.
On the pH, that is quite a drop, which probably means you have little or no carbonate hardness (KH or Alkalinity) in the tap water, as this buffers pH. I would leave it alone until the nitrite is resolved, otherwise it is just going to add more stress if the pH starts fluctuating. Looking ahead, to raise it, we need to know the GH and KH of the tap water; you can get this from the water supply folks, they probably have a website.
You should try to identify the fish; we have profiles with photos, check the catfish for the spotted (I'm wondering maybe a Pictus Catfish?). The white is likely an albino cory, which would be the albino form of Corydoras aeneus or Corydoras paleatus, more likely the former species. [Clicking shaded names brings up that profile.] The orange fish sound like platy.