Fishy_Fun
You have asked several questions.
i have done alot of water changes because my tank is cycling so my fish are stressed.oh and my nitrites are really high too about 2.0 ppm.can i do water changes back to back lets say a 35% water change then a 25% water change?
Something is wrong out there in your fish keeping world.
2.0 is toxic to fish and will be lethal if the fish are exposed to it for a week or two.
IMHO (and I assume that you know the basics)
1) Immediately perform a 50% WC;
2) Rinse your mechanical media in the water from your tank;
3) Check you filtration equipment in order to ensure that it is working;
4) Remove any deleterious material from the bottom of your tank;
5) Do not feed for two days and then feed 1/4 the quantity which you have been feeding for seven days;
6) Check the concentration of your nitrites tomorrow: if the concentration is 0.4% to 0.8% perform a 25% WC: if the concentration is above 0.8% perform a 50% WC.
7) Continue 2), 3), 4) and 6) until your nitrite concentration is zero.
8) Subsequently a weekly 25% WC may be appropriate.
(BTW: I do not understand how you can have had this magnitude of nitrite spike without an associated ammonia spike.)
i was wondering if i could use some aquarium salt for my fish and albino corys?i heard that salt is not good for corys though.
Take my following words with a "grain of salt" (no pun intended) as the induction of salt into a fresh water aquarium is a "currently hotly debated topic".
IMHO do not add aquarium salt to your tank now!!!
Once your tank and filtration media is functioning in uniform, steady state mode adding 1.5 teaspoons of aquarium salt to your tank every couple of months I believe to be appropriate.
TR