Clown Loaches (Not acting normally?)

So I put these Clown Loaches in the tank 2 days ago, 3 of them, to eat the
snails. I was told per my previous posts to use three because they like the
company of other Loaches and that they would eat the snails. Per the
Petsmart instructions I am feeding them dried shrimp. So far they dont seem
to be very active, they found tier holes inside of a few different pieces of
tank decoration (Shells) and they pretty much stay there doing nothing. They
definitly arent eating the snails and they just lay around doing nothing and
dont interact at all.

I have a 20 gallon tank with 18 fish (8 of them are Neon Tetras), Gouramis,
3 Molly's, the Clown Loaches and others. The tanks strip readings are all in
the normal range and the other fish are VERY active. Tank water temp is 81
degrees F.