3 Fish Died

[AndysFish]

Last week I had two fish die, an Orange Platy and a Black Molly. I tested the water to find the NO3 was very high around the 80 ppm figure. I changed 50% of the water, added Tetra NitrateMinus and a few drops of SeaChem Prime.

Today I have a Neon Tetra dead. I have tested the water again but there is nothing unusual.

NH4 - <0.05 ppm
NO2 - 0.04 ppm
NO3 - 10 ppm

Any advice?

P.S I have only had the Orange Platy for about two weeks, prior to this I haven't had any fish die.

 

[Hoveringpie]

Your tank hasn't fully cycled your nitrite should be at 0ppm same for ammonia. Keep doing daily water changes till they are both at zero for at least a week don't add any more fish. You have suffered the common new tank syndrome don't be disheartened though we all go through it.