Need help :( my fishies are dieing

[oXsonriksXo]

Well, yesterday i decided to set up my 37 gal. tank, i did everything i should have. I rinsed the gravel and tank with water along with the plants and accesories. After i put everything back into the tank i added water straight from the garden hose and decholornaited it. I let the water stand until it got to about 80*F 26*C and then added my guppies, dwarf frog and ghost shrimp. Today when i woke up i found all of my male guppies dead and 1 female. Only 1 preganant female is left and is at the top of the tank gasping for air. I also have 2 guppy fry that are still alive too. I dont think it was ammonia poisioning because the fry survived, and the frog and shrimp are doing well.

[Oldfishlady]

Sometimes garden hoses can contain antifungal or other chemicals to retard growths that can be harmful to fish.
You may want to empty the tank and start over and not use the garden hose.
Not all garden hoses contain this stuff and it may not be the cause of the fish deaths since not all fish died...but its a start.....