Sick Platy Please Help

[denismen]

My female platy has been reclusive for about a week now and has not been eating and is losing weight also.
She is staying beneath wood at bottom of tank and  swims up and down the glass erratically and scraped along the wood...it was not like scratching for velvet or white spot from what I could see. She is also flashing occasionaly.
She keeps taking spasms jerking/twitching and I dont know what to do about it.
I tested my water last week and the nitrates were about 80, ammonia about 0-25, nitrite= 0 and PH about 8.
I changed 1/3 of the water in 100 litre tank and next night I tested the water again.]
PH=7.8-8, Nitrite = 0, nitrate =40 and ammonia =about 0-25.
I changed about 1/3 water again and can only hope for the best.
All my other 3 guppies and male platy seem fine and have normal appetite and behaviour it seems.
I added Disease Clear to water also. 1 Guppy has mild shimmies but seems to be getting better.
OK, so for the next 3 days I have tested and changed my water trying to treat this platy.
I changed 50% water daily and deep cleaned the gravel the first water change.
I also added Disease Clear on the first water change and added a tablespoon of aquarium salt at every change.
The fish is still twitching/jerkng every few seconds and is being hassled by the male platy constantly for sex. She swims erratically, when she does swim occasionally, slightly sideways with her body slightly tilted and swimming up and down the glass.
She is only female platry as my other one died last week unexpectedly after being pretty reclusive for weeks.
This platy has become reclusive and hides away constantly also but all my other fish are fine except my male guppy who shimmies slightly also.
My water tests results seem to be improving with nitrate level dropping daily:
I will check water later and possibly change 50% again.
Please HELLLPPPP!
 

PH = 7.4

 

[techen]

Nitrates sound way too high, What are your tap water nitrates?
 
Ammonia could be zero if your using the API test kit.
 
Can I ask what disease clear does? Never heard of that before as well.
 
Could be related to bullying more than likely?

 

[PrairieSunflower]

I think denismen might be using King British Disease Clear (http/www.kingbritish.co.uk/products/aquarium/medicine/disease-clear-aquarium)
 
What is the poop like when you platy and guppy goes?  Is it normal or white and stringy?

 

[denismen]

I am using API test kit and I reckon the ammonia readings are questionable.
Disease Clear is fro King British company and is aquarium fish medicine..for treating bacterial and fungal infections..protects against damaged fins, gills and other body tissues such as fin rot.
What would you suggest I do about the constant male platy harrassment?

Nitrates sound way too high, What are your tap water nitrates?
 
Ammonia could be zero if your using the API test kit.
 
Can I ask what disease clear does? Never heard of that before as well.
 
Could be related to bullying more than likely?

The poop seem pretty normal...I have cut back to a tiny minimum of feed daily until I sort this out

I think denismen might be using King British Disease Clear (http/www.kingbritish.co.uk/products/aquarium/medicine/disease-clear-aquarium)
 
What is the poop like when you platy and guppy goes?  Is it normal or white and stringy?

 

[the_lock_man]

I recommend you buy 2 or 3 more female platies (if you have the room). The male's pestering will then be spread more evenly, and shouldn't overly stress one individual.