Welcome to Fishlore.
Unless you used Bio-Spira or seeded it from an established tank, the 30g wouldn't be cycled in a week. I'd recommned using the
API master freshwater kit to test the water. The strips are not really reliable and can often give very erratic results.
What are you using for tap water conditioner? I'd recommend Prime for both tanks - it will help the fish and protect them from any the ammonia, nitrites and nitrates that could be in the water. It will help stabilize things in the tanks.
Your fish have small white salt-like spots on them, right? If they didn't, I would say they had internal parasites and they might, but that's a guess at this point. They don't need any meds to treat ick, but if you want to add a product called
ICH-Attack to their water - it would be good for them and not harsh. I would probably pick up some parasite clear though, as they might need that. The lack of appetite makes me think that's VERY likely. Parasite Clear is a milder med for parasites but usually pretty effective. I would start treating them with that and hopefully their appetites will return.
To treat ick, you need to raise the water temp to 82-84F and keep it there for 2 weeks. 25% water changes every other day and cleaning the substrate once a week are also helpful.