nitrate should never be 0, whats ammonia/nitrite?
for some reason that I am not seeing, your tank is either not cycled at all, or tests not reading right, even if a mini cycle, meaning the filter are not caught up, or BB disruption there should still be nitrate in the water. The fact that is none suggest the tank is not cycled at all, esp with the bacteria boom along with. I suggest you do not touch your filters for 6 weeks, do not add anything to the water. do 50 to 90% water changes every other day. until you start getting some kind of nitrate reading.
I personally do 90% water changes every water change, yes feed but not allot, only 5 days of the week and only once a day, and no more than they will scarf with attitude in 3 minutes. Thursdays and Saturdays are no feed days for me, the fish will be fine, by and large we tend to really over feed our fish.
Test strips are worthless for the most part, get a API master fresh water test kit, link below.
https://www.bigalspets.com/api-fres...GsgYk2x0HBejMIxb7Oijc_f831jEtmb3YeRoCDCPw_wcB