This is a fairly new tank. I've had a single small comet goldfish in a 2.5 gallon for almost a year (bad I know but he was doing great). 2 weeks ago I saw a 10 gallon on sale at Walmart and thought, ya know it's probaly time to upgrade and give him more room. So I transfered everything from the old tank into the new tank and added a fluval c2 (I like having more filtration than I need, and planned to upgrade the tank again as the goldfish grew).
After about a week everything seemed to be going well so I got 5 tetras and a small cory. 1 tetra died pretty quick, he seemed pretty faded so I figured he was just old. I went back to the pet store, but looking closer at thier tetra stock they all looked horrible. So I got the smallest blue ram they had.
Another week goes by and I decide the ram needs a woman, for some reason I also decided the cory cat needed some friends so I got 2 more. And some frozen bloodworms as a treat for everyone.
So at this point (Sunday) I had
a 2 inch goldfish
2 1.5 inch blue rams
4 neon tetra
3 green cories
Probably too much
I have a liquid test for ammonia, always read 0 through the whole ordeal. Strips told me 7.5ph (I was trying to bring it down to 7 with a small piece of driftwood) driftwood was coloring my water so I was doing a 20% water change every 2 days. Nitrites 0, nitrates between 10-20 (hard to tell on strips, I've ordered a liquid test for this but haven't got it yet).
I'm going to get a 20 long tommorow, hopefully I can get it setup and running before any more losses