K. K. Subash Babu (2012)Horaglanis abdulkalami, a new hypogean blind catfish
(Siluriformes: Clariidae) from Kerala, India. SAMAGRA Vol. 8, 15 November 2012

Abstract
A new species of blind catfish, Horaglanis abdulkalami, is described from a dugout well at
Irinjalakuda, Thrissur District, Kerala ...

not at all..

I have live specimens with me. I am keeping them from September. All of them are healthy

Kryptoglanis shajii is present in open water-bodies also. Please see the link

http://cs-test.ias.ac.in/cs/Volumes/102/02/0161.pdf