What are these fish??

SF, it is possible for them to down a gourami if it was already weakened from severe stress. For your information, SAE's are very active fish and placid ones will certainly not be happy with the constant activities.
 
Nice pics.
 
I think the first pic might be a bumblebee catfish.
SF has already confirmed that it was a garra and not a bumblebee catfish. The latter doesn't suck on glass or it'd seem unusual.
 
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