i'm not sure if this is normal as i have never kept mantellas, but i do know a little bit about them. you shouldn't keep different species in the same tank, for many reasons. is your tank well planted with a lot of hiding spots? leaf litter usually makes frogs feed more secure if you don't allready have some. i do know that the the crocea are a little shy.
http://mantella.amphibiancare.com/species.html
for info on the different species.
good luck and you really should put them in 2 different tanks.
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RES
WTF
FBT
Russian Tortoise
Hingeback tortoise
Leos
Lawsons Dragon
Aussi
Ocelot Gecko
0.0.3 Vietnamese Mossy Treefrogs
Oregon Newt
Japanese FBN
American Bullfrog
0.0.4 D. tinctorius
D. auratus
D. leucomelas
1.1D. imitator
0.0.2 imitator intermedius
1.1.1D. lamasi
Grandis Day Gecko
Mali Uro
0.0.4 Hourglass Treefrogs
Conehead lizard
Painted Turtle
Hedgehog, bunnies, dog, fish, crawfish...

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