Discussion in 'HCRU Crabitat's - Biography's Of Our Crabitats' started by vckums, Sep 22, 2006.
18 E's inhabit this crabitat
Wow, nice crabitat! Your hermies are lucky! Mine only have a 10g, but I only have 2 hermies. Where did you get your plants and rock shelf from? I'm looking for some that are reasonably priced.
Thank you. I got my plants at a local mom and pop place. The rock shelves are actually turtle docks but the company has discontinued them. Not happy about that. I think the plants were 8-10$ they have the heavy rock bases.
that tank looks amazing. You are doing a great job!
Thank you! I try really hard to do the natural look. This time i added a tiki hut LOL not sure how natural that is, but it was cute. Plus is 100% edible!
here are some pics of previous tanks I've had.
My very first tank for the crab we got. Sad Sad Sad
I try to establish that woodsy feeling in my crabitats too. I can only imagine how happy those little guys must be in all that lushness. I was wondering if gauges should always be placed at sand level. Mine are placed about three inches from the tops of my tanks. Am I making a mistake?
I've had them all over, and at times there's usually 2 sets in my tank. One atleast in the middle, and one at the bottom. You want to know the readings in different areas.
At the substrate level in my tank its about 70/71 degrees. In the middle of the tank it's 76/78 degrees. The top right by the lights is 80/81 degrees. So they have 3 levels to choose from to get warm or cool off.
I may get another set for the 20 long. Do all you ecuadorians bury? It seems like that's all mine do except when they bask under the light on the grapevine. I know they love to dig, but is this normal. They can't all be molting.
Yes mine dig alot. I can usually see atleast 1 tunnel in the front. One night hubby and I watched 1 E dig all the way across the tank. It was fun to watch. Lately I dont see but a few out.
vkums.. i have a question. what is the divider for?
It came with the tank. I think the previous owner had 2 seperate sustrates and this kept them seperate.
vkums are y givin away any spare tanks or sellin just want to know o and super great tank u must be proud
If youre in Cali I usually got a few tanks in the shed to pass on to people. Right now I got a 30g long sitting here waiting for a new owner.
I never thought I'd see this, but some of mycrabbies like to bask. I have a 15 watt aquarium light on during the day over the tank and it brings a lot of crabs out. They sit on the second level or hide in the cocohut on the second level. I once counted eight small hermits in that cocohut, one on top of the other. I think it's so cool to see.
My E's are light freaks! LOL There is always a few right up under the lights. They will be there for hours and hours.
For those of you who have hoods that can hold UVB bulbs, apparently there's a better bulb. UVA's. I can't explain it as good as the person I got the info from so let me paste a copy here. The info is from JediMasterThrash.
The only differences between the 2.0, 5.0, 8.0 is in the spectrum of light. How close it resembes white sun light would be shown by how uniform the spectrum over the blue/green/red visible light is (there's alway a spectrum printed on the box). Then they vary in how much UVA/UVB they emit along with the visible light.
Unfortunately, for most tanks it doesn't really matter how much UVB your light is emitting, because about 98% of it will be absorbed by a glass lid. Only UVA will pass through.
Here's a copy of my LHC&HCA post:
Here's some info about UVA:
UVA is mostly transmitted through glass and screens (and is not blocked by normal sunscreen and it penetrates deeper into the skin and causes aging and melanoma). Our crabs are probably a small amount of natural UVA even indoors in crabariums. A UVA light on a crabitat will provide extra.
Reptiles see in the UVA range, so they have increased activity when exposed to UVA.
Here's my source on the UVB-info
chicken wire (very coarse mesh): Reduces UVB by 7%
mesh: Reduces UVB by 15-30%
flyscreen (very fine mesh): Reduces UVB by 50%
Aquarium glass: Reduces UVB by 98.5%
Plexiglass acryllic: Reduces UVB by 20-40%
Combination of house windows and aquarium means that the hermit crabs are getting absolutely 0% natural UVB. If you place a UVB light ontop of a glass or plastic lid, likely only 2% of the UVB is reaching the crabs.
Reptiles use UVB to synthesis Vitamin D3
So, in order to effectively use a UV-light, you need to have the light over a screen or open-portion of the top of your crabarium.
As for lights reducing humidity, it's not something you have to worry about if done right. The heat from lights increases the saturation point of the air, so for a given amount of water vapor in the air, the relative humidity will decrease. However, a properly setup crabitat should have good pools of water and a moist/sandcastle substrate. The radiation from the light will evaporate more water from the pools and surface, increasing relative humidity.
The hotter air will increase air pressure, so the air will try to escape out of the tank, rising out of gaps in the lid. You'll simply have to reduce the gaps in the lid. I always have my tank lid proped open about 15-degrees (PI/12 radians), and the relative humidity stays 75-80%. Of course it helps that I have two tropicaire humidifiers running to keep moist air coming in. But for my ISO, I just prop the lid or de-prop the lid as necessary to regulate the humidity.
The only thing you'll have to do is refill the water pools more often, since they'll evaporate faster, and maybe occasionally mist the substrate (or poor small amounts of water down the sides) to keep the substrate moist.
15w fluorescent UV-lights add a negligible amount of heat. You should put them on timers so that the only come on during daylight hours so as to keep proper day/night cycles for your crabs.
Some crabs will only come out at night. But I've always got a number of crabs that enjoy basking. They will climb up and get as close to the light as they can and sit there all day.
And on top of it all, crabs need higher temperatures that most people's houses provide, and overhead lighting (in my opinion) is the best way to provide temperature increases. Moonglo/nightglo bulbs can provide 24/7 heat, and can be found in 15 and 25w packages so as not to overheat/overevaporate the tank.
And just because I'm trying to set a guinness book of world records here or something, I'd like to mention that my original pair of 25w moonglos are still running! They've been on continuous for 24,500 hours now! They were only rated for like 2000.
For heat, it's fine to go through the glass. Some people have had their glass lids crack from the heat, but mine hasn't yet. Keeping the glass lid over the tank also helps prevent moisture from escaping.
However, you'll need to have the UV light over a mesh or open part. The hood should provide enough enclosure so as to prevent much air from escaping.
Re-reading my original post, I don't think I explored the Plexiglass alternative enough.
Using Plexiglass/Acryllic instead of glass for your lid will provide 60-80% UVB transmission, so it is a good alternative.
Especially if you have a tank with a weird lid that you can't easily get a "hood" for. Like my 92g corner tank. The glass lid is shaped like a baseball diamond with a curved opening. So I can't make any hood fixture fit.
There are several places on-line that you can get plexiglass made-to-order, so it might be possible to get a plexiglass lid special made for your tank, even if the tank is a regular glass tank.
As far as I can tell, it's still unknown if hermit crabs benefit from UVB at all. All the research just shows that Humans and Repitiles use UVB to synthesize vitamin D3.
my tank is very small i only have 2 hermies and i adore them! my theme is tropical!
Cant wait to see your pictures! I like tanks when they are tropical/jungle feel.
I would like to add light to my other two crabitats. My twenty high has the 15 watt 10 gallon aquarium light on over top of the screen top and a piece of plexiglass. This "top" is on the other two tanks, a screen top with a piece of plexiglass sitting on top. This arrangement keeps the humidity in but I was wondering what kind of light set-up you could suggest, nothing fancy, just some ideas maybe? Thanks.
The light system I use is a tri light. It holds 3 bulbs. You can get them at any pet store that sells reptiles or you can check Ebay. Ebay tends to be a bit cheaper, plue there might be used ones. When I got mine it was $60 plus buying the light bulbs. I've had it for 2 years now and its great. You dont have to get one that holds 3 bulbs, you could do the bi light. Those are cheaper as well.
sorry it took me long to post but um yah im in cali redondobeach area to be exact if u really got a tank in the shed sure i would love to take it in i dont have any hermies yet was still lookin for the right tank
thx in advance
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