The photo i took somewhere south of Thiruvanmiyur, Madras.
This is the response from a group:
This is the deadly Irukandji fish, but my 'discovery' is different from this in some ways:
1) mine is a cobalt blue in colour, while Irukandji is transparent
2) Irukandji has only 4 tentacles, mine has more than four.
3) this was found in India, whereas Irukandji is supposedly found only in Australian beaches