I'm really worried about my fish all the time, and that makes me think I've done something wrong. I'm new to all of this, but my family isn't, so I've been getting some advice from my dad, but we all know how dads can be sometimes. I have a 10 gallon tank, upgraded from a 2.5 gallon to stabilize it. In the tank, I have 3 mollies, a platy, 2 balloon mollies, 2 corys, and 2 ADFs. I also have an African Sword and what I think is a water sprite. The 10g is a new tank, but the cycle was jump-started (or so I thought) with a combo of old gravel (from the 2.5), old filter media (from a filter we had lying around) and API quickstart. At first, my ammonia was pretty high, in the stress range. I did a water change (~50% last week), and that put the ammonia at 0, where it's stayed. I thought the tank was okay- none of my fish fight, none were sick. Then, one of my balloon mollies started acting weird and I discovered some white spots on his back fin, and some rips- I was afraid it was ich, but I figured out it was fin rot. I immediately went to my LPS and picked up some melafix, and was informed that ammonia isn't always the biggest problem. Also got some test strips for nitrates and nitrites- which I knew were a part of the tank but didn't think they were dangerous to the fish (I don't know why this didn't occur to me.) My numbers for nitrates and nitrites were super high, so I did an immediate water change (at least 25% yesterday). I took the carbon out of my filter (as per Melafix instructions) and started treating the tank. My fish started to look better, but today I noticed that his eye was all messed up and he had developed ich. Now I'm treating both the 2.5 and the 10 with Melafix. Will moving them to a 20g help at all or would it hurt them more than just trying to treat them right now? Once they (hopefully) get better, I plan to move them anyway just to calm my own nerves about the whole thing. I really don't want to overstock my fish, but I'm afraid that I already have and now they're all going to die. My frogs are fine, and I think they eat enough. None of the fish really bother them, and they've come out more frequently, recently. In fact, none of the fish really bothered each other at all until recently, which is why I didn't think I had an overstocking problem. My numbers as of an hour ago: ammonia: 0 nitrates: 80 nitrites: 3.0 I know both the nitrates and the nitrites are high, but I don't want to change the water too much and get rid of the medicine. I know cories are sensitive to salt, but I do have some and I've heard that helps with nitrites and nitrates. Would it help if I added half (or less) of the recommended dosage? I'm sorry for the long post, I just really want to take care of my fish. This is my first tank and I really love all of them. Pics to follow of the sick fish. Also, the 10g looks spare mostly because I moved some of the plants over to the 2.5 to help with hiding space for Creamsicle (sick fish). The other fish I took a picture of was Garfield, who I think also caught ich. Not sure if it's clear in the picture, but he does look like he has grains of salt on him. None of my other fish have any white spots, or any sign of sickness. Please help. Thanks in advance.