Hmm Im Not Sure

[xNOTLOCx]

well ive had the tank for 2 weeks its a 30 gallon aquarium, nitrate is still low .5 since its new, nitrite is .12 ppm and ammonia is .0ppm just tested after i added the water conditioner calle cycle it says even if i add the entire bottle it wont kill a fish, and the salinity is 1.024 and ph is 8.3 so im lost she was eating last night and when i woke up she was in the corner above the gravel and the eyes wich were black are bright yellow and the head is white, i havent turned on the light usually i do aroun 5:00 and i feed her at 7:00 since i usually get home around then, my tank is new and the water is going good with the live rock and hermit crabs but 2 fish dyed from fin rot they contracted it so fast since there so small they died before i could buy the treatment but this ones fins are perfect and no sighn of any other type of infection so ya im lost