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I am so sorry for your loss. :(

The TDS of your tank water should be somewhere between 34,000 and 45,000. If your TDS meter has a high range then you can very accurately measure salinity. If it's the typical TDS meter it's not going to give you a meaningful answer.

Where did you read that? It was my understanding that there was almost no calcium in their molts and they are nearly pure chitin. I'm asking to see if I need to update my understanding. A lot of my information is outdated lately it seems.

It's thinner than what you would see for other crabs. It looks more like a spider's molt.

Pegasus, you will soon notice a hermit crab molt rolling around on your sand bed. Just watch for it.

Hey Snake, how many like this have you been asked to preserve?

Yep

A couple feeding per week should be sufficient. You probably don't want it to grow too fast anyway. They will curl up for a while before they eliminate but other than that and while actvely feeding they should be wide open to gather light. Another possibility is that it's been in less light...

It might be possible at a specific gravity of something like 1.050 but I would thing everything would suffer if that were the case. It's also possible if PH was very low but again, everything would be suffering, not just the carbonate consumers.

OK. Unless my chemistry is off one of those numbers isn't right. I'm not trying to be difficult, I just don't think Alk can be that high with Calcium at 500ppm.

If your test kit is accurate then your Calcium must be rock bottom. How did your Alkalinity get so high?

How high is it?

This behavior will only last a couple more decades or so. The larger is stating dominance. This is necessary or they would both turn female and then one of them would have to die.

In my experience this happens when Alkalinity dips below ideal. Have you tested Alkalinity?

Stunning. I have no other words.

I meant, which one? If it's chlorine then you can just let the water sit for a day to get rid of the chlorine instead of using a chemical that gets rid of the chlorine but also removes oxygen from the water..

Sometimes the cure is worse than the disease.

does your city use chlorine or chloramine to disinfect the water?

Most of the small active swimmers require frequent small feedings. This is a reason they don't do well in the hobby. Examples are Anthias, Redspot Cardinalfish, etc. If sedentary small fish are an option they tend to thrive in a captive environment like Neon Gobies, Barnacle Blennies, Clown...

:) Mandy beat me to the punch. :p