I don't think we should duplicate the info that is already available, just profile some of the fish that are not "on the main road". Laura can do the bit about CTPK, for example

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I was wondering for a while, while full tails have been classified into many types, CTs - not so much. And it's obvious that they come from various tail shapes. More attention is paid to the type of branching than anything else. (For example, why a CT with a tail on the short side, indicating some PK ancestry doesn't keep its tail fully spread, as a PK would?)
To cut it short - I think we should limit such a section to the types that we (each) own - just like the Gallery section, but not necessarily with pictures - on a I-need-to-share-this-about-my-fish basis.
On the forum there are already a number of posts in various sections containing information that i, for one, would like to revisit in the future.
I thought we were talking about profiling betta species, not strains?
Anyhow, if anyone want to write up betta profiles, go ahead and start a new thread in the Gallery section, and post your article as the first post. I'll then review them and pin the thread. Name your thread "Profile: xxx", where xxx = B.pugnax, B.Channoide, B.Splendens halfmoon, B.Splendens crowntail etc (hope you get my idea). Make sure that you reference your article properly.
That's simple enough to do, and is all that can be done for now.
The type of articles that in my opinion would most useful (let's hear it if you think otherwise) will have the following structure:
The article should talk about identification characteristics, behaviour, habitat and diet requirements, maybe perhaps some history, geographic distribution etc. The article should be objective and give an overview about the species/strain in a general sense. Focus on facts, refrain from "my fish" comments, although tank parameters and food choices for captivity would be good information to share.