high nitrate and ammonia

[kaineo]

i am currently having a problem with nitrate and ammonia in my 40 gal reef. i did a 5 gal water change 2 days ago, and after then my ammonia went up to around .10 ppm. i knew something was wrong because my mushrooms started shirveling up very tiny. my nitrates are staying around 10ppm. i run two canister filters and i think thats the problem. i have prob 30-40 lbs of live rock. should i just take all the bio media out of the canisters and just use them for water flow? would my live rock be enough to do the bio filtering.? HELP ME PLEASE