Well white spot is generally caused by extreme changes in water, not necessarily bad water quality. I am not an expert on white spot as I have never had a fish with it. But has there been a change in water as in temperature? New fish? New plants?

You're going to have treat this as soon as possible so I hope you have already gotten stuff and have started treating your tank as pleco's don't have normal scales as I'm sure you know So any skin diseases will affect them much worse than other fish and it will often lead to death.

Do some research on white spot, go ask your local fish/pet shop to see what white spot treatment they have and I would recommend you join a tropical fish forum. Though we are more than happy to help, this is a goldfish forum and we only know so much about tropical fish. As maybe how you treat pleco's is different to how you treat goldfish if you know what I mean. Plus I bet there is plenty of experts on pleco's on the internet who could help you

How did you stock the tank?
Even if the water quality was spot on before you added your fish, if you added all at once the filtersystem is overloaded with the bio load.

White spot can develop because of a weak immune system, which again is caused by stress.

Platies, Mollies, Guppies, Tetras are all schoaling fish. If kept less than a shoal of 5-6  they don't feel safe and hide. This is what's wrong with your Platy too.

I'm not sure sorry. However I think this a great forum (Link is not visible to guests. Please register to view.) and I'm sure they'd know They were really helpful when I had some tropical questions.

There is salt available especially for tropical fish, it is meant to improve the slime coat. To be used according to the instructions, depending on the size of your tank

   we're here to help, 

You gotta remember not everyone is from America So sometimes it isn't that easy.

Oh of course But a person could get confused and go mad looking for a medication when their country doesn't stock it, so sometimes I think it is better to say go to your local pet shop and look for some medication for white spot. Not go here and buy this.

We've got some American ich tabs actually, in the pet shop I forgot their names... xD Made by Jungle, anyway d:
But not all the medicines are available everywhere of course! So that should always be taken into consideration c:

... not to forget, lol, in the meantime we already know what we need.... most times anyway but we can help other members and this makes us kinda feel good  ... love helping people...

lol,,well thx for all the advise ,,just to say i live in scotland,,i did research the whole pleco white spot thing but couldnt get a definate answer so i took a big risk and raised the temp and treated with normal aquarium salt,,kept the temp up for about 10 days,,and im glad to say my risk paid off,,all fish and pleccy are doing great,,,only thing is im sure my little plec doubled in size in that time,,lol,,he was just under 2 inch when i started and now hes about 3 1/2 inch and hes a lot broader,,lol,,,again thx for all the help

(Link is not visible to guests. Please register to view.) is not a disease but merely a symptom that is seen in many oral conditions, some benign and harmless and some serious. Although on most occasions, these white spots on tongue are asymptomatic in nature.The treatment of white spots on tongue will depend on the factor causing it. In case of pre-cancerous lesions, it is of utmost importance that the person stops the intake of tobacco completely. He must get the condition properly diagnosed though, to begin with, after which the doctor will mostly prescribe vitamin A supplements and ointments to apply on the lesion.

No, the previous poster is talking about human symptoms.