Sinking Platy

Test strips are better than nothing but you really need to test for ammonia & nitrite with a liquid test kit. Maybe you can just buy the nitrite & ammonia test kits? You can order them really cheap online too, $20-25 including shipping:

http://www.amazon.com/gp/offer-listing/B000255NCI/ref=sr_1_1_olp?ie=UTF8&qid=1347496710&sr=8-1&keywords=api+master+freshwater+test+kit&condition=new
 
I havent used the strips myself but they are not reported to be very accurate. If at all possible its better to get a liquid kit where you can see the different values. Even they cant test for everything of course.

In the meantime I would do 50% water changes every one to two days and see if the platy improves. If there is no improvement whatsoever at least you can rule water out.
 

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