Here are my answers to the emergency questions -- feel free to ask any follow ups! More than willing to make adjustments to any of this. Thank you so much!
1. What kind of substrate is used in your tank and how deep is it?
Combo of play sand and eco earth -- approx 50/50 (? it was a long time ago that we mixed it!). It's about 5 inches deep -- not quite half the total depth of the aquarium.
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?
Yes, this cheapie by Zoo Med:
http://www.petco.com/shop/en/petcostore ... dity-gauge. It's located about 1/2 way up the back wall of the aquarium, in the left corner. Temp is usually close to 80, humidity usually close to 80%.
3. Is a heat source used in the tank? If so, what?
We have used a seedling heat mat similar to this one:
http://www.gardenersedge.com/hydrofarm- ... p/MT10006/ We prop it up against the exterior rear of the tank (it almost covers the back wall) and use it as needed to keep the temp around 75-80 (rarely in the summer, more often in summer).
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)?
One bowl of bottled distilled water, and one bowl of salt water which is made with Instant Ocean (
http://www.instantocean.com/Products/Se ... xture.aspx). We add about 1/4 cup to one gallon of distilled water.
5. What kinds of food do you feed and how often is it replaced?
Variety of fresh foods: (all organic, unsweetened) lettuce/other salad greens, crushed nuts/seeds, tiny-diced fresh or dried fruit. Often drizzle a couple of drops of fish oil onto the lettuce to make "crab salad" which seems to be Sam's favorite. Add a pinch of dried brine shrimp to this. All that goes into his food dish and is changed daily if he's up and around. When he goes underground, we put "dry food" (ie dried coconut + brine shrimp) in the food dish, and basically don't changed it until he "wakes up." Also leave one of these "mineral blocks" --
http://www.petco.com/shop/en/petcostore ... ral-blocks -- out most of the time, discarding only when it looks really dirty and used-up. Also have a cuttle bone in there, as well as a couple of sea sponges, all of which he nibbles on/plays with.
6. How long have you had the crab and what species is it, if known?
About 3 yrs, pretty sure he is a purple pincher (based on purchase at a chain pet store and the descriptions/photos I've seen here)
7. Has your crab molted, and how long ago did it happen?
Multiple molts. Not sure when last one was off hand.
8. What type of housing are the crabs kept in, what size is it and what kind of lid is on the housing?
10 gal glass aquarium. Mesh lid, however we keep an open plastic-covered three-ring binder on top of it to keep the humidity in. Usually it's only covering about 80 % of the mesh, we move it around depending on hygrometer reading. (Also a heavy book on top of the binder, to protect from the sometimes-curious cat!)
9. How many crabs are in the tank and about how large are they?
One crab. His big claw is just over 1" at its widest measurement. (Just measured to order more shells!)
10. How many extra shells are usually kept in the tank, if any?
Right now he has 3 extra shells (turbos) but one is way too big (2+" opening) and 2 are too small (just barely 1" opening). Ordered more last night. However at the time of the "disappearances" of crabby 2 and crabby 3, there were always at least 5 shells available, all reasonable sizes for both crabs.
11. Have there been any fumes or chemicals near the crabitat recently?
No.
12. How often do you clean the tank and how?
We will occasionally (maybe 2 times a year?) take Sam out, take out all the dishes and play things, rinse them with distilled water, scoop out any yucky pockets in the substrate, dig up any buried shells, and neaten up. In between, we just scoop out yucky bits, and rinse the dishes & sponges with distilled water as needed -- maybe every week or so when he is active. We have never taken out all of the original substrate and deep cleaned.
13. Are sponges used in the water dish? If so, how are they cleaned?
Sponges (2) are not in the water dishes, they are just lying about. Rinsed with distilled water when they look extra dirty or are dry.
14. Has anything new been added to your crabitat recently?
Two days we replaced the fake plant with a live pineapple plant! Sam loves it. (not really relevant to The Case of the Disappearing Crabbies, but... fun!)
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.)?
Think that's it!
16. Please describe the emergency situation in detail.
N/A