This is what I did.
Hampalong said he was on the PFK forum, but I didn't think he'd use the same user name.
The fish looked very much like barbs, which are cyprinids.
Hampalong said they weren't oddballs but they were as good as, which to me meant they were very rare.
So I went to PFK forum, cyprinid section, and went through the posts one by one. On the third page I found a post titled
Rare barbs - any interest - and the poster's name was black ghost. Hampalong did say he used to have an oddball, the black ghost knife fish.
So I clicked on the post and read
"I have a pair (1m, 1f) of Hampala ampalong...." I stopped reading at that point as I was sure I'd found it
Thinkfish user name hampalong
Fish name Hampala ampalong
It had to be.
Then I googled that fish name and found
this link to another PFK thread and in post 14 was another picture with a title.
I tried giving clues. I said to think of a place to look - since hampalong is a PFK member, that was the obvious place to go.
I'd already said it was a barb, and said that barbs are cyprinids.
I said read everything hampalong had written - he listed black ghost among his previous fish. And I said that two words had given me a clue - again, black ghost.
That's how you cheat and be devious
Edit - have now corrected the spelling of the user name and fish name
I think I have mentioned in the past that I type all the right letters but not necessarily in the right order.