JohnB wrote: Hi everybody,
I'm new to this and I need advice from you. According to the guy I bought the tarantula it must have mould already. I did not find any mould in enclosure. He/she is a spiderling. Spun an web very small in the enclosure of +- 70mm x 70mm 2x heat mats average temperature 15C is that why he or she does not mould?
John 
First, as a newbie you have a lot to learn about these amazing creatures. If you visit
Stan's Rant
you'll see four books recommended. I urge you to read all four. Note that I didn't say you should go out and buy them! (Although you certainly can if you wish.) Get to know your friendly, neighborhood, public library instead. The chances are good that they have one or two of the titles on their shelves even as you read this. They can always get any of them you need through the Interlibrary Loan System, as well.
In a perfect world you would read them in the order they are presented, do so if they are all available. If not, read them in any order you can.
Do not order all of them at once! There's far too much reading and you don't want to break your brain. (Breene's
Quick and Easy Tarantula Care is only 64 pages long, but
The Tarantula Keeper's Guide has 384 pages!) One at a time is best.
And especially, read the part about not trusting pet shop advice at least twice!
Ditto, about not trusting Internet care sheets too much!
Next, you state that you have a spiderling, and someone else claims that you have a
Lasiodora parahybana. I would have chosen a different tarantula than this for a newbie, but now that you have it, we'll go with it.
Baby and spiderling tarantulas less than 3.5 cm diagonal leg span (the distance from the tip of one front leg to the tip of the rear leg on the opposite side when the tarantula is resting in a "normal" posture. Also called DLS.) must usually be kept in smaller containers with little ventilation and on about 2 cm of damp substrate. The two kinds of substrate most commonly used in the hobby are peat (a.k.a., peat moss, black peat, Canadian peat, sphagnum peat, but
NOT sphagnum moss), and shredded coconut husk (various trade names). Peat is usually much less expensive and available from garden, landscaping and horticultural supply stores. Shredded coconut husk is readily available from pets shops, but more expensive. Each has their advantages and disadvantages, but on the whole they're about equal. Here is a photo of what I mean. (Click the thumbnail for a larger version.)
(Uploaded with
ImageShack.us
)
From a leg span of about 4 cm and larger almost all tarantulas may be kept in a bone dry cage with a water dish. It's not a bad idea to cover all the open areas of the cage somehow to reduce ventilation. Here is a photo of what I mean. The white stripe down the length of the cover is actually a strip of Magic Disappearing Tape that didn't disappear in the camera's flash. It's holding the ends of a sheet of plastic food wrap, wrapped around the cover, together. (
Brachypelma emilia)
(Uploaded with
ImageShack.us
)
Between these two sizes (i.e., between about 3.5 to 4 cm leg span) the spiderling's container should be allowed to dry out slowly over two or three molts. That will give it plenty of time to adjust to the drier conditions.
Next, very tiny, baby tarantulas will molt as often as ever three or four weeks. As they grow their molting frequency diminishes so that by the time they are two-thirds grown they're usually only molting once a year. However, having said that, there is a lot of individual variation and you'll get to know your tarantula's idiosyncrasies as time progresses.
Thus, it almost surely did recently molt for the person who sold it to you, and it surely will molt for you again, but probably not for some weeks to some months. In the meantime, you need to feed that tarantula as much as it will eat.
Lasiodora parahybana are among the largest tarantulas in the world, and if cared for properly it may quite likely reach a DLS of 28 cm! "Cared for properly" boils down to meaning, "Feed it as much as it will eat!"
Again,
you need to read those books as soon as possible, and you need to search this and other Internet forums to learn as much as you can about this species.
Enjoy your 8-legged behemoth!