Carla did you actually read the thread before posting? It was made quite clear by all that the trademe seller was calling glowlight danios "glo danios" by mistake, and this was what the query was about. This was spelled out in the first few posts of the thread.
the "true" (a better term might be "the original") upside-down catfish is Synodontis nigriventris but lots of the mochokids swim in an inverted manner and many of them are just loosely called upside-down cats in shops (especially if they don't know what species they are).
the white cloud mountain minnows in shops in UK are the same as ours, but the minnows you might catch from the streams in the UK are a completely different species
easy to sex. Males are skinny, females plump. But they eat their own eggs so unless there's a spawning grid or something equivalent in the bottom of the tank to protect the eggs, you'll get no results.
this is a bit wierd but I used to have a whiptail that would disappear from its tank. I would then find it in a different tank. I wasn't moving it, there was no-one else to move it. I think it may have had some kind of teleportation device secreted somewhere in the room. I never did figure out how it was doing it. Eventually it disappeared for good. True story (seriously!)
there are three different types of invertebrates called daddy long-legs: crane flies, harvestmen, and daddy long-legs spiders. All of them are completely harmless.
I'm not sure how the spines connect in the jaw (I have a Pakistani loach skull somewhere but I'm not sure where at the moment). Its possible the base of the spines are used in crushing snail shells, or it could just be they click the spines at the same time as crunching the shell with their teeth
the spines sit under each eye. All loaches have them. They use them for defence and communication (by clicking them). When erected they curve out to each side like boar's tusks. In a school of loaches you often hear them clacking their spines as they interact with each other, and yes it often does sound like glass cracking!
you can breed albinos to normals if you want. If you can't find any more albinos then you could just breed one of the offspring back to the albino. But I doubt it'll be too hard to find more albinos at some stage. How many of each do you have?