Hello. My son and I just set up our first 30 gallon tank about a month ago. We've got live plants including 2 amazon swords, some dwarf grass, 2 anubius, spider driftwood, two hiding nooks, etc. We cycled the tank, testing with API test kit. Once the tank ran through the cycle, we jumped on getting our fish. Probably every newbie's mistake, lack of patience! Anyways, we've got 2 dwarf gouramis, 4 balloon mollies, 4 corycats, 3 loaches, and a bumblebee cat. We put those guys in there about 4 days ago. My issue is, yesterday my ammonia increased a bit to .25ppm, my nitrites were about .25ppm-.50ppm (difficult to tell the colors were very close) and nitrates are 40ppm, Ph 7.4. I did a partial water change last night, treating for chlorine obviously, and re-tested water today. Ammonia 0, Nitrites .25-.50, Nitrates 40ppm, Ph 7.4. Should I just keep doing partial water changes until I can get these levels to go down to 0? I vacuumed the substrate a bit during water change yesterday and clipped a few of the leaves that looked like they weren't doing well. Now that I've begun reading about aquarium keeping a bit more in depth, I'm thinking I really have no idea what the heck I'm doing. Oh yeah, all of the fish look pretty good except two of the mollies' fins are tucked. One was actually sort of stuck on the filter this afternoon, as if the suction had trapped her. I thought that was weird. I didn't really notice that they were acting differently from the other fish until I started reading more. We do not have a second tank set up as a hospital yet. I didn't even know there should be such a place! Anyways, needing advice on getting these water levels to go down!