well i know that this is not the quickest board that responds to things. but ne way here it goes,.
Well, It has been slow through the summer but most posts get answered in a day or two at the most.
1. is this tank decent for 1 MHD. 2.5 feet tall, 3.2 feet wide, and 1.4 feet deep. These are off by some because i am measuring with a 1 foot plastic bendy ruler(couldn't find my tapemeasure)
Optimal tank height is 3' but 2.5' would get you by.
2. i have a 10in. dome that has a 20 watt, Super UV Coil-Lamp in it it says, 20watts=75watts on a regular bulb so its really like a 75 watt light bulb. but it doesn't get hot at all. my first lizard (curly tail)(desert) (it died and it was really sad) needed a light bulb so it was supposed to be around 100 and i got a 60 watt bulb and it got it upto about 90. and i needed another. anyway. this bulb does not equal 75 watts cause i put the 60 watt in there and it got upto like 85 and i took it out and used this 1 and it barely gets upto 70. so what do i need to do. i have a smaller dome (5in.) would that make the temperature go up some. or if not whats a bulb i can get to make it get to like 75 degrees?
This was really hard to follow, but simply put, they don't need a heat source. Is your house ever below 68œ? They do need a UVB light and that usually will put off enough light to boost the temps to 78œ and at night you want a drop to the upper 80's. Be sure to use a thermometer and if your daytime temps are less that 78 then start with a 25w bulb and increase if needed. It is better to err on the cool side than to get it to hot.
3. what are some plants that could be put into the cage(natural plants)(heard some ppl on this board saying they put them in there.)and i need a site where i can get a TALL branch to go in there(need 2)she has nothing incredilbly high to climb)
I have already posted this many times so I will refer you to my old post. You can read this answer at forum.kingsnake.com/mountain/messages/5770.html.
4. is it good for her to sit in water for long periods of time. cause my mom got this thing on sale called a ABORAL LAGOON here is what it looks like. http://www.pet-expo.com/cgi-bin/FULLPRES.exe?PARTNUM=ZMAL10&LARGEVIEW=ON
well i have some water sitting in it and when i put her up for the night she lays like her lower half and her tail in there for the entire night. is that ok for her?
It is normal for them to sit in the water, but not dangle the tail. I would guess that the lagoon just happens to be infringing on her favorite perch. Maybe you could move it a bit. If she is actually sitting in it that is normal. I read your post above on the fat & lumpy question. Just before they lay the eggs the female may sit for hours in the water. Then she will start digging. If you do not provide a place for her to dig a nest she could have problems or she may pick a spot, lay the eggs, and then scatter them as she will try to bury them and in the process they will wind up all over the place. I have tried using a box with soil before and my females never seemed to figure out that they were supposed to use it as a nest and laid the eggs on the tank floor.
So, I really recommend that you put 4-5" of soil in the bottom of the whole tank. This will allow her to pick her nesting site. I wouldn't mess with any "soil". Instead, if you can't get a brick of coir fiber, bed-a-beast or equivelant, use moistened peat moss or worm bedding. If you use worm bedding make sure it isn't the recycled paper stuff.
Last, if you haven't had her to a vet, make sure you have her checked for parasites. If she is gravid I wouldn't take her in but you should take in one of her poos and have it checked. If she is gravid and carrying parasites chances are real good that she will die.
The site Joe was directing you to is www.froggieb.com/MHDCaresheet.html or you can find it in the kingsnake caresheets.
Good luck,
Marcia 
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