Help! my guppy died

So yesterday I did a test on my water and found my nitrates a little High so I did a partial water change today and let it sit for a few hours and then I walked over to the tank to check on my fish and found my guppy had died we had named him soldier becuse he was the only fish that survived my tank set up and high levels oh PH and now my mollys look like they are stressed so I tested the water and came up with
10 ppm Nitrate
2.0 ppm nitrite
7.2 PH
0 Ammonia

the water is a little cloudy so I added some crystal clear which the guppy did fine with before can anyone help me figure out what I need to do before I lose any more fish

before my little soldier died we had
3 guppys 1 male two female
2 mollys 1 male one female
1 platy male
in a 20 gallon tank

 

How long has your tank been set up...is the tank fully cycled?

 

Try testing the tank 24 hrs after the water change to be sure of the nitrites being over 0. If it's still over 0, i'd do another water change after the testing.

you may have had a spike from Soldier dying or the tank may be uncycled now. What are you treating your tap water with?

 

my tanks been set up for 2 months I thought I was cycled maybe I'm wrong
I'm treating the tap water with Aqua safe water conditioner and aquarium salt
and I have the aqua clear filter with the incerts one to help clear the ammonia and the other is the charcol packet

 

have you been adding the aquarium salt for the 2 months the tank has been setup? i'd recommend only using the salt to treat illnesses that call for that as a treatment. over time the salt can build up and raise the salinity of the water and/or cause problems with over-production of slime coating.

the tank could be cycled and just had a spike. we've had that happen after a fish died. 24 hours after a water change gives the water time to settle and give you a more definite reading. we use Prime to treat our tap water & highly recommend it, especially if a tank has any ammonia or nitrites, but it's always a super water conditioner.

 

yes ive been adding the salt the whole time that's what I was told to do, I allway thought it wsa getting sucked up with the vacume. Well now my male molly is lying on the bottom acting like hes dying I just don't know what to do I don't want my whole tank whiped out by morning

 

they told us that too. I think the pet stores tell everyone that.. it sells merchandise. Of the livebearers, only mollies are said to like a little salt, but we've gone with what the experienced fish keepers here have told us and found our fish to be a lot happier in leaving salt out.

do you have a hospital tank for your molly? do you have any melafix? Since you don't have any air-labyrinth fish, it would be ok to use melafix in the tank as a general med. until you can be more certain of what's wrong.

If his gills are red or purple that would point to ammonia or nitrite poisoning and the course to follow for that would be water changes and, if you can, treating the water with Prime or Amquel+.. or moving him to a cycled hospital tank or one that has water treated with a water conditioner that locks the ammonia, nitrites and nitrates (like Prime or Amquel+).

If you could post a picture of him and/or describe his condition in the freshwater diseases forum, you'll get more members looking at that and more help with diagnosing and treating him.

What is the water temp currently?

 

I don't have any of the stuff you asked about I have ammolock but I don't think that well help the temp is currantly 78

 

Is his condition the same? Most pet stores should have those products if you're in the US, especially the big chain stores.