LOL, I've been through the same thing. All 42 fish have names, some are actually the kind of fish and that's the only name it has at this point but all have names. I started taking on the challenge of learning the different types. Still far from good at it and you may or may not know this but some fish will change not only in coloration but in type as well. some do not change (Such as Sanke) it may start out three colored but falls back to two, but it will always still be a sanke. However take a Ki Kikokuryu. It could lose the yellow and and become a kikokuryu, or it could take on a deeper golden orange coloration and become a Kin Kikokuryu. Another change that can take place is a Tancho Kohaku can become a simple kohaku if it loses the red spot on the forehead, But even if it is turns solid white it would still be refered to as a Kohaku. If you woulds like I can try and identify and tell you what each fish is, But I would need individual pics. also let it be known that I am a novice at this as well so I may not be 100% correct. But it gives me a challenge to figure them out. I have also been trying to learn the Koi lanquage. As a simple pet owner no it's not necessary, But get around people that show and they take you more serious when you identify what you have, the breeder, and how old. All that lanquage comes from japanese lanquage so learning how to pronounce some of the words gets to be a challenge in itself.
My question is this, Where did you come up with Menkaburi Kohakus? That's totally new to me and I can't find anything that would even be close to that name.