Hermit crab was sluggish but fear has died

[RoughPaws]

1. What kind of substrate is used in your tank and how deep is it?

Coco mix with Sand eco teria brand

2. Do you have gauges in the tank to measure temperature and humidity? If so, where are they located and what temperature and humidity do they usually read?

Temps 25.8 - 27oC
Humidity 75-85%

3. Is a heat source used in the tank? If so, what?

Spot lamp 100w but sits over the water tank area

4. What types of water are available (fresh or salt) and how is the water treated (what brands of dechlorinator or salt mix and what ratio is used to mix it)?

2 7L tanks fresh water and Salt water
Treat fresh water with fish tap safe and test with dip kit to make sure water is clear of chlorine ect
Salt water is treated with same water process and then add 33g per L using Instant Ocean

5. What kinds of food do you feed and how often is it replaced?

Fruits, nuts, fish flakes, hermit crab food (as a treat) eggs crushed shells cuttle bone, dried shrimp, meal worms. Pretty much everything I saw they could eat online.

6. How long have you had the crab and what species is it, if known?

This one since September he is a PP

7. Has your crab molted, and how long ago did it happen?

Not sure he borrowed within a week after getting him and he's also disappeared here and there since.

8. What type of housing are the crabs kept in, what size is it and what kind of lid is on the housing?

They are in a 90w 60h 45d vivarium. Top I have sealed to keep humidity in

9. How many crabs are in the tank and about how large are they?

5 small to a very large one (I accidentally bought one and didn't understand the size until I got her xD

10. How many extra shells are usually kept in the tank, if any?

I have 3-4 Shells for each small one the large one has 3 at a time in the tank

11. Have there been any fumes or chemicals near the crabitat recently?

Never

12. How often do you clean the tank and how?

Daily

13. Are sponges used in the water dish? If so, how are they cleaned?

No

14. Has anything new been added to your crabitat recently?

A new crab

15. Is there any other information you would like to share that might be helpful (anything that is regularly part of your crab care, playtime, bathing, etc.)?

His body is chalky but pincers are purple

16. Please describe the emergency situation in detail.

Yesterday I woke up early hours to go to work and as I always do check on them late at night as they are mostly active then I noticed this chap was hunched out his shell me being worried I opened the door and just slight moved him and he was sluggish but did move.
I had read some crabs sometimes surface molt and they normally slow up and the skin changes colour ect. So I just thought well if he is going to molt here I shall place him in a iso tub so the bigger one doesn't get peckish.

It's been a few days now but it has started to smell fishy I don't want to disturb him but not sure if he has passed.

Any help would be grateful as I am new to this hermit crab stuff.

[JoeHermits]

A sudden strong fishy smell often indicates death. Sometimes they last a few months but those who are purchased sick, injured, or extremely stressed may not give a lot of obvious symptoms until it’s too late


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[RoughPaws]

not a good sign then, I shall move him out the tank as he still hasn't moved since Thursday.

Thank you for the reply