01-20-2014, 12:58 PM
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This means there's not enough oxygen in the tank. Also a high possibility of toxins.
Do you have a filter and heater? Need the heater since you have tropical fish...need the filter because you have living things in a tank....
Did you fully(FULLY) cycle the tank? If you just set the thing up and dumped in water and fish, or let it run for a week or two after filling it up, that's not cycling. It takes 4-8+ weeks to properly cycle a tank, and it's a good bit of work too, you also need an ammonia source to start it. If you did NOT properly cycle the tank, and test it for several days after completion to see if it stayed stable, it likely was not and your fish are being poisoned by the system getting itself in order.
Try changing about 35-40% of the water and get a good testing kit(not strips, they're never accurate and pet shops use them often and rarely give numbers. Get the API Master Freshwater Test Kit) to make sure you're going the right way. If the tank isn't properly cycled....I'd send the fish back to the store and get a refund, wait until it's done cycling and then get your fish.
If the tank is cycled or almost finished, there are a few things you can do to help, but no guarantees on survival for the fish. Make sure the temp is proper for your platies(76-78 degrees), and make sure you have the room for them. You can also get a bubbler with an air stone to help out with oxygen, water changes will also help(depending on what your stats are...if you have ammonia you can do two 25-30% changes per day until it evens out), be sure you treat the water good before changes. Seachem Prime is a good water conditioner as it detoxifies nitrites and nitrates and removes ammonia(though it wont stay removed if you have a problem in the tank like over-stocking where the fish make more waste than you can remove).