spiderling phlogius strenuus unknown cause of death! help

[matty_c]

hey all i had purchased a 20 mm spiderling online
about 7 weeks ago.
it died 1 day ago and i do not no why.
temp was around 25 degrees and it was living in the container
it was shipped in.
which is about 5 cm wide and 6 high.
help

 

[Veredus]

Air holes?

 

[KaaTom]

are you sure its dead and not moulting

 

[matty_c]

yep its got an air hole at the top. around half a cm big.
its definetely dead bacause ileft it over night and it still hadnt moved
this morning.
still have no clue what it died from
any suggstions?