65 gallon LJ project

I can't believe you never heard of the blind cave tetra? They're an old fashioned fish... (I didn't know the other 2 as well)
 
Well, they were on the google image search I did, as were a couple others...but like I said, I just went with pics. Just now I googled again...well, I think you're right...not a fish I'd want to keep...Is there a not "blind" version?
 
The story of the goby is as follows: After reaching approximately two kilometers exploring the area, we began to collect fish, it was here that the water reached our ribs and when lifting the nets, we had big green bugs walking on the net less than one meter from me, I was terrified and even though I endured it for a few minutes, I finally decided to get out of the water. It was not until after an hour when we decided to return to where the truck was and to my bad luck, I had to enter the water again to return. My friends started trying to catching fish on the way back to the cars with little luck. After walking for a while through the water I felt a little safer so I took a net together with another friend and we dragged it from the bottom, the muddy bottom and full of sticks stuck in the Cabombas did not allow walking very comfortable, my friend He slipped and fell and as I could, I collected the rest of the net so there was the only fish that we could catch on the way back, an Eleotris picta of approximately 5 cm, when I took it out of the water it had a yellow color like mustard, but then it took on its dark color with the characteristic white dorsal line, it is a magnificent fish and I really like its behavior, although we have never seen that yellow color again, it looks very good and personally I would like to return it to its habitat.
 
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Well, they were on the google image search I did, as were a couple others...but like I said, I just went with pics. Just now I googled again...well, I think you're right...not a fish I'd want to keep...Is there a not "blind" version?
We don't have the blind cave tetra, we have a species of the same genus Astyanax, we commonly call it "Sardinita" here in Veracruz:
Screenshot_20200824_212257~2.jpg
 
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The scientific name is that of the blind cave tetra, apparently there is a normal variant next to the blind cave tetra, but they're the same species. I did not know this... the blind cave tetra is in about any book from the 50's and on and they never mentioned that. But it makes sense to me now I was thinking why are there blind cave tetras in a river?
 
Unfortunately, the tank is not having a good time. 5 deaths in the last five days is absolutely nothing normal.
Only two corydoras loxozonus remain, which have been the most affected, one dying every day as of last Saturday. The wild scalare angel also passed away, along with one of my celebes rainbows. I have siphoned thoroughly, because I noticed some parts where the detritus is caked next to some dead leaves, this is one of the reasons why I think the corys were affected, also the pH level is quite high for them, I have to find a way to lower it to 7, take your opinion:
20200824_164418~2.jpg
 
Don't be swayed by false red in the Nitrate test, the camera takes colors a bit stronger than they actually are. I calculate between 25 and 30 ppm in Nitrates. These tests were performed before siphoning.
 
pH test with the new water that I replaced yesterday after siphoning. This is the water that I use for the tank:
20200824_222729.jpg
Local aquarists have suggested that I use water with a pH of around 6, as there may be something in the tank that raises it.
 
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