Hi Taker,
First of all, thank you for your kind words.
As regards your queries (I tried to mutiquote them, but failed...):
1. Fighting Pleuros
The video shows only two in a small tank. We don´t know if they have just been put together or what is the "behind story".
I believe the dinamic of a group is important and once the group is formed it works well without fights. I have read that it may be dificult for a group to accept a newcomer but have not tried it. Furthermore, I read different experiences as regards the result of a pair being formed within a group: some people say they isolate the others which would recommend taking them out; with others, the group remained tight.
2. Tankmates
When I introced my group to the 150g they were relatively young and I introced the 2 BN plecos and the 3 ctenopomas at the same time.
It worked well from the beginning: the accepted the ctenopomas (nowadays they feed at the same time as per the video) and ignored the BN plecos.
I believe pleuros are among the channas that better accept tankmates but you have to choose non agressive ones and introduce them when they are young.
3. Pleuro Variants
I believe there are none. Never read about it, at least.
4. My feeding regime
I used to feed 6 days oer week when they were younger (1st year).
Nowadays I give them a "wild feeding regime: every 2 days as a rule, but sometimes everyday and sometimes 3-4 days between meals. It depends on how hungry they look and how the water is.
I try not to have significant water changes because pleuros are sensitive to them and usually don´t change more than 15% at a time and amximum 1xweek