Hi all.
Real sorry to do this but I'm going to upset the Applecart!
There is much confusion over Nemurus / Wyc etc etc.
I will further muddy the waters by saying that there is also another Mystus / hemibagrus species called / labelled as Mystus Filamentus!!!
This fish however I believe to be Nemurus as it had 2 fin extensions to the Dorsal fin & had very little red to its tail if at all. If anything it was a shade of yellow.
I believe what Necronis (apolgise for the spelling) has described on here to be correct.
Generally 90% of the time anything with a true Pink / redtail is Wkycloides.
Back to the original thread I used to have one of these splendid fish, in fact Ive had two.
The 1st which i believe was Nemurus/ Filamnetus was given to me by my local FS as it was destroying EVERYTHING they put in with it and could no longer afford to have a rapidly growing fish taking a whole tank to itself.
It was approx 10" and was housed in my Tropical Pond with a 24" RTC, a 22" L.Mammoratus & a 18" G.Gourami.
It very quickly grew too approx 19" before it meet its untimely demise as some IDIOT (Me

) left a large opening in the cover after some maintainace.
By the time it had reached this size it was pretty much the Daddy of the pond & was definately aggresive but not so much that it was a problem.
It would even hand feed!

I think however this was most definately the EXCEPTION to the rule & who knows how aggressive it may have become when bigger.
The 2nd one I had was 100% Wkyloides & was again picked up as someone had given it to one of my local shops.
This one was only about 4 - 5" and was an absolute brute - spent all the daylight hours hiding only to terrorise the aquarium during evening hours.
Bite marks started to appear on my much larger Fish, particulary my Knifefish so a friend took him off me.
If i could house another one, Id love to try again.
They are truly "WICKED" fish in every sense of the word.