I have uploaded a photo and hope it helps.
As for water parameters, I check them every week when I check my freshwater. The pH is a little higher then my Amazon tank, but I'm also not treating it with Blackwater solution.
Last test was Thursday, 23rd. Ammonia and Nitrite were 0, Nitrate at 5.0, and pH at 7.4.
The only thing I can think might be stressing them is when I purchased my second group of tetras, a fry (approx 1/8th an inch and mainly transparent) was in the bag with them. Rather then introduce the unknown species fry to my community tank, I put it in with my Goldfish. It's now 2/3" long and developing fine. I'm thinking guppy, due to tail length in proportion to the rest of the body. Anyhow, that's the only think that's changed in the tank.
Again, any help would be appreciated.