What I should do is a pioneer appreciation document. To let these pioneers know how much I appreciate and love what they have accomplished and discovered.
I think you're thinking about this the wrong way. You should ask for permission, plain and simple. You WILL eventually run into legal issues asking for forgiveness instead of permission. All it will take is one person that gets pissed that you're making money off their photo, and it's over.
I really admire the energy you're putting into this, but I think you need to step back and look at what this is actually going to take. You really need to get experience with these animals to write a proper book on them. I don't want to speak for anybody, but I don't think that MFK will want to officially promote a book written by someone who has never kept the fish before.
You might think that everything in your book is accurate, but at the end of the day you don't know what you don't know. Besides the fact that I ran out of steam, this is a big part of what stopped my book - I've never kept a shark or ray in my life. I like to think I know what I'm talking about, and I can help 9/10 people down the right path, but there are so many things I don't know. It wouldn't be right, IMO, for me to put a book out there without knowing those things.
I don't want to discourage you, I honestly think it would be a great idea to have a collective book on monster fish, but you're about twelve steps ahead of yourself on this. Keep the fish, learn the stuff, talk with the people keeping them, THEN work on the book. Don't worry about promoting it with MFK, with Youtubers, don't worry about selling it, just get it made first. Don't count your chicks before they hatch.