Tropical aquarium fish Platy

Newly set up Tropical fish aquarium..4 fishes dead aleady ..Please help

We set up a tropical fish tank recently and 4 fishes already dead.We are really worried.Our pet store people seems to be of little help.Let me give you a timeline of what happened so far.

Mar 28

We went to petco and brought a top fin 10 gallon with filter and some water treatment samples that came along with.Since our kids didn't want goldfish, the pet store people told us, we can still keep other cold water fishes.The asked to set up the tank as per the instructions and come back after 24hrs to get the fish.
We went home and cleaned everything and filled the tank with water (treated conditioner).
Mar 29
We went to get the fish, but now another store lady says, there is no cold water fish other than goldfish can go in that tank.All other fishes need a heater to survive.So we brought the heater and set that up 70-80 degrees temp.
Mar 30
Went back to the store and brought 1 red wag platy(female), 1 sunset platy(female) and 1 yellow guppy(male).Everything looked fine and they were swimming fine.We fed them twice a day.

After a day, we noticed that sunset platy was always sitting under the plant or near the heater while yellow guppy&red platy was swimming.After 2 days, found yellow guppy wrapped around the filter and dead.After 1 week from the start, Red wag was dead and only sunset platy was alive and was still hiding near the heater.

Yesterday we changed 10% of the water and cleaned the ornaments, filter etc.Added 2 more guppies and 1 more sunset platy.Now we had 2 guppies, 2 platies.
Everything seemed normal(still platy was hiding would come only for eating) and were eating good.

Today morning I noticed that both the guppies were acting weird.They were vertically moving toward the bottom and upon hitting the bottom they act as if they gasp for air and swim fast towards the top.We really thought they were dead at some point and when we tap the wall, they will move.Unfortunately by today evening both guppies died.

We noticed that one of the platy is heavily breathing and still at the bottom of the tank.While another platy tries to push or pick on it.

Called the pet store and they advise to change 50% water change.We changed almost 90% water and cleaned everything.Now the heavily breathing platy looks OK.But the second one is acting as if it is shivering.

1.We saw lot of uneaten flakes while cleaning.too much actually.May be we were over feeding?
2.Why guppies died?
3.After water change, platy is acting as if it is shivering and hiding under.

Fish question

by Ivarsgirl

I'm fairly new to keeping tropical fish but I love it :)
I have guppies, danios, mollies and plecos together in a tank. I noticed today at petsmart the guppies and mollies had a note "requires aquarium salt" but the danios and plecos did not. I picked some up.
I assume the plecos and danios will not be harmed by the salt if I put it in for the benefit of the others - but you know what happens when you assume.
Anyone out there know if it's OK to put it in?

Easy in a way...

by Kestrel_42

It is easier to care (longterm) for a larger tank than a smaller one, but it still takes work.
First, don't mix tropical fish and turtles. They have different needs (in terms of tank set-up) and anyway, the turtles will just snack on your fish. So figure out what you want in the tank first.
Starting a new fishtank takes a bit of time, because you shouldn't just go out, buy a tank and some fish and set it up all at once. Talk to some people at aa aquarium specilty store (please not a petsmart kind of place-they are clueless) an they will help you figure out your equipment needs, tank set-up etc.

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