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All dead fish must be removed immediately

Nitrates again, and a sick fish. Nitrates need to be near zero.

My comment was a generalization, I was trying to be helpful. The chances this member has the tank set up for either of the above species is minimal, considering they are asking the question about hardness and Tetras.

It applies to all fish if you look closely at them.

No other fish, just be happy that these guys are getting along ok with each other.

As a fish ages their scales change, if your fish have dark edges on their scales, then it is an old fish. Young fish have bright scales, older fish have duller scales with black lines on the edges.

No Tetras will be happy in hard, Alkaline water. Think of another species maybe some of the Barbs could suit you.

I don't think that I have posted this image on here before,

Wow, I have never heard of any of this, great information.

I understand, things will settle down with time

That is a shame.

Your pH at 8 is too high for Ram's, they also enjoy warmth. High Twenties.

I always run acid tanks No Ammonia, No Nitrites, No Nitrates. My tanks are well planted. Can I say you seem to be chasing your tail a bit. As suggested in another post, can you change your water source? Preferably to rain water.

The test strips have given you all the information you need, they have shown you that there is Ammonia in your tank, that is all you need to know, the amount doesn't matter as the figure needs to be zero.

This is a highly modified goldfish genetically, therefore there is often a cost to have a fish like this and sometimes as they age they develop swimming disorders, it is just one of those things. I always prefer to select fish that are going to be stronger genetically.

pH of 8 is too high for a Betta

Wow. That will be a challenge in any tank!!

If you can put a couple of suction cups on the heater and attach it to the wall of your tank about two inches from the bottom.

Can you post a photo of the whole tank? please.

You may have disturbed an anaerobic pocket under the crypts. I wouldn't be too concerned, just monitor the fish for now.