I was going to say! That many fish in a 5 gallon - bad! Plus goldfish are some of the dirtiest fish out there,so putting them with platties and guppies is a bad idea.Not only because goldfish produce alot of waste and amonia,but also because goldfish are cold water fish and platties and guppies need heaters.
What did she clean the tank with? There could of been chemical residue in the glass or the gravel or anything,if she used them when cleaning! How about nitrates and things? Have she had those checked?
* Lisa *
* To the world you are ONE person,but to a rat you are the world *
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* It's a rat thing...you wouldn't understand! *